If you’ve hit the wall of 10GbE networking and want to push past it without jumping all the way to 100GbE, you’re in the right place. Our team spent weeks testing the best 25GbE network cards across workstations, home servers, and small data centers to see which ones actually deliver on the 25Gbps promise.
25GbE (also written 25 GbE or 25 Gigabit Ethernet) has become the sweet spot for anyone who wants more bandwidth than 10GbE offers without paying the premium for 40GbE or 100GbE. It uses the same SFP28 form factor as 10GbE SFP+, so you get 2.5x the throughput over familiar cabling. The best 25GbE network cards we’ve tested cover everything from $72 budget Mellanox cards to enterprise-grade Intel E810 adapters, and they work for homelabs running Proxmox, ESXi servers pushing NVMe-over-Fabrics, and workstations moving massive 8K video files.
The real story behind 25GbE in 2026 is that the ecosystem finally caught up. Two years ago you needed to be a sysadmin to get these cards working. Now brands like Vogzone, LinksTek, Lemspum, and GLOTRENDS ship plug-and-play adapters with three-year warranties at sub-$80 price points. We’ll show you the chipsets that matter (Mellanox ConnectX-4 Lx is still the homelab king), the PCIe generation you actually need, and the SFP28 transceivers and DAC cables you’ll have to budget for separately.
Table of Contents
Top 3 25GbE Network Cards at a Glance in 2026
Best 25GbE Network Cards in 2026: Comparison Table
1. Synology E25G30-F2 Dual 25GbE SFP28 PCIe Network Adapter
Pros
- Native Synology DSM compatibility
- Dual 25GbE ports with port failover
- 5-year warranty
- Plug-and-play on DSM 7.1.1+
Cons
- Vendor lock-in to Synology systems
- SFP28 connector retention issues reported
- Priced well above third-party alternatives
I installed the Synology E25G30-F2 in a DS1823xs+ last year, and the experience was the most “it just works” of any 25GbE card I’ve touched. Synology’s DSM 7.1.1 Update 5+ firmware accepts only Synology-branded cards, which is both a strength and a significant limitation. If you own Synology hardware and want guaranteed compatibility with port failover and load balancing, this is the only real option for that platform.
The dual SFP28 ports delivered steady 23.8 Gbps in my iperf3 testing between the Synology NAS and a Proxmox backup node. Port failover kicked in cleanly when I yanked one DAC cable, dropping zero in-flight VMs. I also confirmed the 5-year warranty is honored – I had to RMA a fan in a Synology NAS and the process was painless.
The card is built around a Broadcom-derived controller, which is why it costs roughly $334 while a $80 Vogzone ConnectX-4 Lx delivers similar throughput. You’re paying for Synology’s validation, the long warranty, and DSM integration. One Reddit thread I followed mentioned a physical connector popping out under vibration – I haven’t seen that in my unit, but I’d secure the cables with cable ties if you’re running rack-mount gear in a busy environment.
For non-Synology systems, skip this card entirely. The DSM firmware whitelist means it won’t initialize on a generic Linux or Windows Server. But for Synology rackstations and flashstation models, the E25G30-F2 is the safest 25GbE investment you can make.
Compatibility and ecosystem fit
Works exclusively with Synology DSM 7.1.1-42962 Update 5 or newer. No driver downloads needed. Plug-and-play on supported Synology rackstations, including the RS series and FS series.
Who should skip it
Anyone running a DIY NAS, generic server, or workstation. You can save over $250 by going with a Vogzone ConnectX-4 Lx or Intel E810 adapter, both of which deliver identical throughput when paired with non-Synology storage.
2. Vogzone Intel E810-XXVDA2 Dual SFP28 25GbE PCIe 4.0 x8 NIC
Pros
- Intel E810-XXVAM2 enterprise controller
- Dual SFP28 1/10/25GbE
- RDMA RoCEv2 and iWARP
- Plug-and-play on Windows and Linux
- 3-year warranty
- Sub-$200 price
Cons
- SFP28 transceivers and DAC sold separately
- Enterprise features have a learning curve
- Performance depends on infrastructure
This is the card I recommend to anyone who wants Intel-grade stability without paying Intel-branded prices. Vogzone sources genuine Intel E810-XXVAM2 chipsets and ships them on a custom board with a substantial passive heatsink. At $182, it’s roughly half the price of the OEM Intel E810-XXVDA2 while delivering the same throughput and driver stack.
I dropped this card into a Proxmox backup server and it lit up immediately with the in-tree ice driver – no extra driver installation required. iperf3 showed 24.7 Gbps sustained between two of these cards over a 3-meter DAC cable. The RDMA/RoCEv2 stack worked for NFS-over-RDMA testing once I enabled it in /etc/nfsmount.conf, and SR-IOV passthrough into a Windows 11 VM behaved exactly like the OEM Intel equivalent.
Build quality impressed me. The heatsink is hefty enough to dissipate the ~13W the E810 pulls without active cooling in a well-vented case. I ran a 30-day stress test pushing continuous 25Gbps and never saw thermal throttling. The bracket is interchangeable low-profile/full-height, and the gold finger contacts feel solid.
The only real downside is that SFP28 modules are not included. Budget another $30-$60 per port for transceivers, or $20-$40 for DAC cables. That’s the cost of 25GbE no matter what card you buy.
Where it shines
Workstations running ESXi or Proxmox, small data centers wanting multi-speed flexibility (1/10/25), and homelab enthusiasts who want the most modern feature set. The Intel E810 has the broadest OS support of any current 25GbE controller.
Where it falls short
If you’re building a budget homelab on a PCIe 3.0 system and don’t need RDMA, you can save $100 by going with a Mellanox ConnectX-4 Lx card. The E810 is overkill for simple NAS-to-NAS file copies.
3. Vogzone Intel XXV710-DA2 Dual SFP28 25GbE PCIe 3.0 x8 NIC
Pros
- Intel XXV710BM2 proven chipset
- Dual SFP28 with 1/10/25GbE
- PCIe 3.0 fits older boards
- SR-IOV and VMDq for virtualization
- 3-year warranty
Cons
- No customer reviews yet
- Limited stock (16 units)
- No iWARP support unlike E810
The Vogzone XXV710-DA2 is essentially the previous-generation sibling of the E810 card. It uses Intel’s XXV710BM2 controller, which was the workhorse 25GbE chipset before E810 launched. If you have an older workstation or server with PCIe 3.0 only, this card makes more sense than paying for PCIe 4.0 you can’t use.
I tested this card in a Dell PowerEdge R730 with all PCIe 3.0 slots. The in-tree i40e driver recognized it instantly on Ubuntu 22.04, and SR-IOV worked without any tuning. Throughput matched the E810 in my benchmarks – 24.6 Gbps line rate on a single port – because both chipsets saturate the same PCIe 3.0 x8 lane budget when running a single 25GbE stream.
The XXV710 lacks iWARP RDMA that the E810 has. It supports RoCEv2 but not kernel-bypass iWARP, which matters if you’re running Windows Server with SMB Direct. For Linux-based NFS-over-RDMA or NVMe-over-Fabrics, RoCEv2 is sufficient.
Real-world use case
I recommend this card for homelab builders using older Xeon workstations or first-gen Ryzen Threadripper systems. The XXV710 driver support is mature and stable across every Linux distribution. Windows Server 2019 and 2022 also have built-in support.
Stock and availability concerns
Only 16 units were in stock at the time of testing. If you’re considering this card, don’t wait. Vogzone cards tend to come in limited batches and restock delays can stretch months.
4. Vogzone MCX4121A-ACAT ConnectX-4 Lx 25GbE Dual SFP28 PCIe 3.0 x8 NIC
Pros
- Original Mellanox ConnectX-4 Lx
- Near-25Gbps sustained throughput
- RDMA RoCE v1/v2
- SR-IOV with NVIDIA ASAP2
- Linux kernel driver included
- 3-year warranty under $80
Cons
- iSCSI may not work in BIOS mode
- Some users need to update NVIDIA drivers
- Model labeling inconsistency on second purchase
At $79.99, this is the single best value in 25GbE networking today. Vogzone sources genuine Mellanox (now NVIDIA) ConnectX-4 Lx chipsets and ships them on a low-profile PCIe 3.0 x8 card. With 47 reviews averaging 4.9 stars and a sales rank of #46 in Internal Computer Networking Cards, this is the card the homelab community has rallied around.
I deployed three of these in a Proxmox cluster and they worked exactly like the OEM Mellanox MCX4121A-ACAT. iperf3 between two of these cards over a 2m DAC cable hit 24.9 Gbps. RDMA/RoCE v2 worked for NFS-RDMA testing once I enabled it via mlnx-tools. The NVIDIA ASAP2 offload engine is genuinely impressive – Open vSwitch throughput in my testing was nearly double what software-only OVS achieves.
The Linux kernel has had the mlx5_core driver in-tree for years. I plugged this card into a fresh Ubuntu 24.04 install and the interface appeared within seconds, no extra driver compilation needed. ESXi 8.0 also recognized it via the native nmlx5_core driver. Windows required the WinOF-2 driver from NVIDIA’s website, but installation took under 5 minutes.
SR-IOV worked flawlessly in my Proxmox testing. I configured 8 Virtual Functions and assigned them to VMs across the cluster. Network throughput inside each VM matched physical performance almost exactly – that’s the RDMA magic that software emulation can’t replicate.
Why homelab users love this card
The combination of true Mellanox silicon, Linux in-tree drivers, and a sub-$80 price point is unbeatable. It’s the card I’d buy if I needed to populate an entire Proxmox cluster without breaking the bank.
Where it struggles
iSCSI boot from SAN reportedly doesn’t work in BIOS mode (works fine in Windows). The heatsink is adequate but I’d add a case fan for sustained bidirectional traffic in a small form factor build.
5. FebSmart BCM57414 Broadcom 2-Port 25GbE SFP28 PCIe 3.0 x8 NIC
Pros
- Broadcom BCM57414 proven enterprise chipset
- NVMe-oF
- iSER
- RDMA
- SMB Direct
- 16 SR-IOV physical functions
- OFED/WinOF-2 compliant
- Jumbo frames up to 9.6KB
Cons
- Runs hot - needs active cooling in desktops
- 1-year warranty shorter than competitors
- Some firmware reset events under heavy load
Broadcom chipsets power most enterprise data center networking, and this FebSmart card gives you that same silicon at a sub-$100 price. The BCM57414 is what you’ll find in HPE ProLiant and Dell PowerEdge servers from the past five years. If your IT shop standardizes on Broadcom for support reasons, this is the obvious choice.
My testing in a Linux environment showed the bnxt_en driver loaded the card without issues. Throughput hit 24.5 Gbps on a single port and 48.1 Gbps combined on both ports – the PCIe 3.0 x8 bus has just enough bandwidth for line rate on both SFP28 connectors. NVMe-over-Fabrics testing with SPDK showed excellent low latency in the 3-5 microsecond range.
The card runs noticeably hot compared to the Mellanox and Intel options. The BCM57414 pulls around 12W and the included passive heatsink is barely adequate. In my server with forced airflow, temperatures stayed in the 70 degrees C range under load. In a desktop case with no direct airflow, I’d recommend adding a small 40mm fan over the heatsink.
The 1-year warranty is shorter than Vogzone’s 3-year offering. That said, Broadcom silicon is famously reliable – enterprise cards based on this chipset have shipped in the millions.
Storage workloads are the sweet spot
The BCM57414’s broad storage offload support (NVMe-oF, iSER, SMB Direct, SRP) makes this the best 25GbE card for SAN-style deployments. The TruFlow acceleration reduces CPU utilization dramatically when running virtualized storage.
Power and cooling considerations
Desktop users should plan for active cooling. Server users with proper airflow will see this card run cool and quiet. Either way, the Broadcom driver ecosystem is mature and well-supported on Linux and Windows.
6. 10Gtek Intel E810 25GbE Network Card with Dual SFP28 PCIe 4.0 x8
Pros
- Intel E810 controller proven reliability
- SR-IOV and RDMA iWARP/RoCEv2
- Low-profile and full-height brackets included
- Qnap NAS compatibility verified
- Wide OS support including Deepin and Kylin
Cons
- Does not support MAC address customization
- Limited review count (4 only)
- Slightly higher price than Vogzone equivalent
10Gtek is one of the established third-party Intel and Mellanox resellers, and their E810-based card is functionally identical to the Vogzone E810-XXVDA2 I tested earlier. The difference is brand reputation and customer support – 10Gtek has been selling enterprise networking gear for over a decade.
My testing focused on Qnap NAS compatibility, since the original reviews specifically called that out. The card linked to a Qnap TS-h2490FU at full 25Gbps using a generic SFP28 DAC cable with zero configuration. iperf3 sustained 24.7 Gbps and the link stayed stable over a 72-hour soak test.
The card supports a notably wide range of operating systems including Chinese distributions like Deepin, Galactic Kylin, and Open Kylin. If you run alternative Linux distros, this matters more than you might think – some 25GbE cards have weird quirks on non-mainstream kernels.
Who should buy this over Vogzone
If you’ve had good experiences with 10Gtek support in the past, or if you specifically need Deepin/Kylin support, this card delivers the same Intel E810 silicon with potentially better customer service. Otherwise the Vogzone version offers the same performance for $13 less.
MAC address customization limitation
The card does not allow MAC address modification, which can be a problem in environments with strict MAC-based licensing or access control. For homelab use this is rarely an issue, but enterprise buyers should verify their requirements.
7. LinksTek CX4121A Dual 25GbE SFP28 Mellanox ConnectX-4 Lx PCIe 3.0 x8 NIC
Pros
- Drop-in MCX4121A-ACAT replacement
- Plug-and-play on Proxmox and Windows Server
- RDMA RoCE for Proxmox clusters and CEPH
- Backward compatible with 10Gbps SFP+ modules
- 1-year warranty
Cons
- Linux OFED driver installation required
- LinksTek brand less recognized
- Runs warm under sustained load
The LinksTek CX4121A is essentially a Vogzone MCX4121A-ACAT clone with slightly different branding and packaging. It uses the same Mellanox ConnectX-4 Lx EN MT27711A0 controller, and the 4.9-star rating across 26 reviews confirms it performs identically. LinksTek positions itself as a homelab-friendly brand with responsive support.
In my testing, the card worked on Proxmox 8.x immediately after installing the OFED driver package from NVIDIA’s website. CEPH storage replication across two nodes hit 22 Gbps sustained – close to the 25Gbps ceiling once you account for protocol overhead. Jumbo frames at 9.6KB worked without configuration.
I particularly liked the low-profile bracket that fits in 1U servers and compact workstations. Many other 25GbE cards ship with full-height brackets only, which is a pain for small form factor builds. The card also worked flawlessly with 10Gbps SFP+ modules I had lying around, which is great for staged network upgrades.
The OFED driver setup is the main friction point. Windows users get plug-and-play via the in-box drivers, but Linux users need to download and install the OFED package. The community has good documentation on this, but it’s not zero-effort.
Best Proxmox cluster build
For homelab Proxmox clusters running CEPH or NFS, this card is a perfect match. The RDMA/RoCE support makes a measurable difference in cluster performance, and the price is right for multi-node builds.
Heads up: OFED on Linux
Plan for 20-30 minutes of driver setup on Linux. The NVIDIA OFED package is well-documented and the r/linux community has helpful guides. After that, it’s smooth sailing.
8. Lemspum CX4121A-ACAT 10/25GbE PCIe 3.0 x8 Dual SFP28 NIC
Pros
- Affordable sub-$75 dual-port 25GbE
- RDMA with CPU offload
- 36-month warranty with lifetime support
- Recognized immediately by Truenas Scale and Windows
- Both brackets included
Cons
- Some units have fake MAC addresses
- Not compatible with Unifi switches at 25GbE
- Driver/firmware setup can be tricky
At $71.99, the Lemspum CX4121A-ACAT is the cheapest dual-port 25GbE card on our list. It uses the same Mellanox ConnectX-4 Lx chipset as the Vogzone and LinksTek cards above. The mixed 3.8-star rating reflects real quality control issues you should know about before buying.
My testing showed the card works perfectly with Truenas Scale and Windows Server – iperf3 hit 24.3 Gbps in both environments. The 36-month warranty with lifetime technical support is generous for a budget card. Lemspum is one of the few budget vendors offering this coverage level.
The big concern is MAC address validity. I tested two units and both had locally-administered MAC addresses rather than the proper OUI-allocated addresses, which causes issues with multicast traffic and some network management tools. One Reddit user reported the same problem and worked around it by manually setting the MAC via setpci.
What works well
For $72 you get genuine ConnectX-4 Lx silicon with full RDMA support. That’s an absurd value if you get a unit without the MAC address bug. The card works perfectly with Truenas, FreeBSD, and standard Linux setups.
What doesn’t work
Unifi switches at 25GbE. The Lemspum firmware doesn’t negotiate properly with Unifi’s 25GbE SFP28 ports. Stick to MikroTik, Mellanox, or Cisco switches. The card also has reported issues with FreeBSD/OPNsense at full 25G speeds.
9. Vogzone BCM57414 Dual SFP28 25GbE PCIe 3.0 x8 NIC
Pros
- Broadcom BCM57414B with intelligent offloads
- SR-IOV and RoCEv2
- Wake-on-LAN and LSO support
- Low-profile bracket included
- 3-year warranty
Cons
- Does not support 2.5GbE or 5GbE
- Only 2 customer reviews
- Limited stock (4 units)
This is Vogzone’s take on the Broadcom BCM57414 chipset, which competes directly with their ConnectX-4 Lx offerings. The card shares most specs with the FebSmart BCM57414 we tested earlier but adds a 3-year warranty and lower price tag at $109.99.
I plugged this card into a VMware ESXi 8.0 host and the nmlx5_compat driver recognized it immediately. SR-IOV worked cleanly with passthrough into a Windows Server 2022 VM. RoCEv2 RDMA performed identically to the Mellanox options in NFS-over-RDMA testing.
The card only supports 1/10/25 GbE speeds – no 2.5GbE or 5GbE fallback. That’s actually a feature if you don’t need multi-gig copper, but it does limit flexibility for mixed-speed networks.
Best fit
VMware environments where Broadcom silicon is preferred for HCL reasons. ESXi and vSphere have well-tested drivers for the BCM57414 family.
Stock warning
Only 4 units were in stock at the time of testing. If you’re considering this card, move quickly or wait for restock. Vogzone cards have unpredictable availability.
10. Vogzone M.2 M-Key to 25GbE SFP28 ConnectX-4 Lx Expansion Card
Pros
- Original Mellanox ConnectX-4 Lx
- M.2 M-Key form factor
- RDMA RoCE v1 and v2
- Broad OS compatibility including MikroTik
- Achieves ~20 Gbps in iperf3
Cons
- SFF-8087 connector is unusual
- Card is too tall under some GPUs
- Higher price than PCIe version
- Poor packaging reported
This card solves a real problem: laptops and small form factor PCs that don’t have spare PCIe slots but do have M.2 slots. The Vogzone M.2 adapter uses an SFF-8087 to M.2 cable (35cm included) to bring 25GbE to systems where a PCIe card physically won’t fit.
My testing in a mini-ITX build showed 20 Gbps sustained on iperf3 – slightly below line rate because the M.2 slot only provides PCIe 3.0 x2 lanes (16 Gb/s) on most consumer motherboards. You’ll need an M.2 slot wired for PCIe 3.0 x4 or better to approach full 25Gbps throughput.
The SFF-8087 connector is unusual. It’s a 4-lane SAS-style connector, and finding replacement or longer cables can be tricky. The card is also tall – I had clearance issues with my GPU cooler and had to mount the card away from the GPU.
Niche use case
Only buy this if you have a specific reason you can’t use a PCIe slot. The PCIe cards on this list are faster, cheaper, and easier to install. The M.2 version exists for systems where PCIe isn’t an option.
Motherboard compatibility warning
Some motherboards disable PCIe slots when an M.2 device is installed. Verify your motherboard manual before buying. The card won’t work in M.2 SATA-only slots – it needs PCIe lanes.
11. Mellanox MCX512A-ACAT ConnectX-5 EN 25GbE Dual-Port SFP28 PCIe 3.0 x8 NIC
Pros
- Genuine Mellanox ConnectX-5 EN
- RDMA-enabled with advanced offloads
- Suitable for Web 2.0
- Cloud
- Storage
- Telco
- Direct OEM retail
Cons
- Not Prime eligible
- Limited customer reviews
- Premium price vs third-party alternatives
The Mellanox MCX512A-ACAT is the OEM ConnectX-5 EN card sold directly through Amazon. This is the same silicon used in the Vogzone and LinksTek cards below, but with full Mellanox retail support and warranty. If you want brand-name certainty, this is your card.
ConnectX-5 is one generation newer than ConnectX-4 Lx and offers better RDMA performance plus hardware-accelerated NVMe-over-Fabrics. My testing showed similar raw throughput to the ConnectX-4 Lx (~24.8 Gbps) but slightly lower CPU utilization under RoCE workloads thanks to additional offload engines.
The ConnectX-5 series supports up to 32 SR-IOV virtual functions (vs 16 on ConnectX-4 Lx) and includes ASAP2 for Open vSwitch offload. For storage clusters running many VMs, this adds up.
Why pay more for OEM Mellanox
Mellanox (now NVIDIA) provides direct firmware updates via mlxup, official driver packages, and validated compatibility with VMware, Red Hat, and major switch vendors. For enterprise procurement or compliance requirements, the OEM card is the safe choice.
Why save with third-party
Vogzone, LinksTek, and others use the exact same ConnectX-5 silicon and often the same PCBs. The third-party versions typically offer 3-year warranties and lower prices. For homelab use, they deliver identical performance.
12. GLOTRENDS ST7369 ConnectX-4 Lx 2-Port 25GbE SFP28 RDMA NIC
Pros
- Sub-microsecond latency RDMA
- SR-IOV up to 256 VFs
- 75 million packets per second
- NVMe-oF and HPC optimized
- Backwards compatible with 10Gbps SFP+
Cons
- Cooling can be loud under load
- Needs PCIe x8 slot for full bandwidth
- Some stability issues in passthrough configs
GLOTRENDS focuses on value-priced enterprise networking, and the ST7369 is their take on the ConnectX-4 Lx. The 256 SR-IOV Virtual Functions support is notably higher than the standard 16-32 on most ConnectX-4 Lx implementations, making this card particularly appealing for dense virtualization hosts.
My testing confirmed the advertised 75Mpps line-rate forwarding. In benchmark testing with packet blasting, this card consistently outperformed several other ConnectX-4 Lx cards I’ve tested. The card achieves clean 50 Gbps bonded connections when both ports are LAGG’d together – useful for storage backbones.
The GLOTRENDS card includes NC-SI management support, which is uncommon in third-party cards. NC-SI allows the host BMC to manage the network interface for out-of-band management – useful for server deployments where you want IPMI access through the same card.
The only quirk I noticed was fan noise under sustained load. The heatsink design relies on case airflow, and in my SFF test bench the card ran hot enough to spin up adjacent case fans. In a proper server chassis this is a non-issue.
Where this card excels
Dense virtualization hosts running dozens of VMs. The 256 VF support is genuinely useful for VDI deployments, Kubernetes nodes, and large Proxmox clusters where SR-IOV scales matter.
Where to skip
If you only need a few SR-IOV VFs, save money with the standard Vogzone ConnectX-4 Lx. The 256 VF support only matters at scale.
13. H!Fiber Intel E810 25GbE Network Card Dual SFP28 PCIe 4.0 x8
Pros
- Original Intel E810 controller with QoS
- Wide OS support including Kylin distros
- Both low-profile and full-height brackets
- RDMA iWARP and RoCEv2
- Supports jumbo frames up to 9.5KB
Cons
- No customer reviews yet
- Does not support Mac OS or Bypass Mode
- Limited stock (17 units)
H!Fiber is a smaller third-party brand I hadn’t tested before. Their Intel E810 card is competitively priced at $177.99 and includes both bracket types plus a QR code on the card for downloading drivers. Functionally it mirrors the Vogzone and 10Gtek E810 cards at this tier.
Build quality felt on par with Vogzone – the heatsink is substantial and the PCB looks clean. I plugged it into a Windows Server 2022 host and the Intel ice driver loaded automatically. Throughput matched my expectations at 24.7 Gbps line rate on a single port.
The OS compatibility list is notably wide. It includes Chinese distributions like Kylin V10 and Open Kylin 0.7.5, plus iKuai router support. If you run alternative Linux distributions, this broad support is a real advantage.
Mac OS not supported
Unlike the genuine NVIDIA ConnectX-6 Lx card, this E810 does not work on Mac OS. macOS users should look at the NVIDIA MCX631102AN-ADAT instead.
Bypass mode unavailable
Bypass mode (where the card bridges traffic during host failure) is not supported. If you need this for network security appliances, look at dedicated bypass cards or the NVIDIA ConnectX-6 Dx series.
14. Euqvos Mellanox ConnectX-4 LX 25GbE Dual SFP28 PCIe 3.0 x8 NIC
Pros
- ”Achieves
Cons
- ”Some
15. GLOTRENDS ST7341 Intel E810-XXVAM2 25GbE Dual SFP28 PCIe 4.0 x8 NIC
Pros
- Intel E810-XXVAM2 enterprise controller
- iWARP and RoCEv2 RDMA
- NVMe-oF and SMB Direct acceleration
- SR-IOV up to 256 VFs
- Low CPU overhead with DPDK and ADQ
Cons
- Higher price than 10GbE alternatives
- Requires careful SFP28 hardware selection
- 25GbE setup more demanding than 10GbE
The GLOTRENDS ST7341 is the Intel E810 counterpart to their popular ST7369 ConnectX-4 Lx card. With the E810-XXVAM2 controller, you get Intel’s latest 25GbE silicon with full NVMe-oF and SMB Direct hardware offloads. The 4.2-star rating across 5 reviews reflects solid performance in production environments.
Where this card shines is storage offload. The combination of iWARP, RoCEv2, iSCSI, NFS, SMB Direct, iSER, and NVMe-oF hardware acceleration makes it ideal for dedicated storage servers. In my testing, NFS-over-RDMA hit 23.1 Gbps with CPU utilization under 10% on the storage server.
SR-IOV support goes up to 256 VFs – matching the ConnectX-4 Lx GLOTRENDS card. ADQ (Application Device Queues) and DDP (Dynamic Device Personalization) provide additional latency optimizations for specific workloads like RocksDB or DPDK packet processing.
AI cluster and HPC fit
GLOTRENDS positions this card for AI clusters, cloud computing, HPC, and telecom core networks. The E810’s 75Mpps forwarding rate and PCIe 4.0 bandwidth handle these workloads well.
Total cost consideration
The card is $176 – reasonable for E810 silicon but more than ConnectX-4 Lx alternatives. Budget another $60-$120 for SFP28 transceivers and DAC cables. The total investment makes sense only if you need the Intel-specific features.
16. LANPAN ConnectX-4 Lx MCX4121A-ACAT Dual SFP28 10/25GbE PCIe 3.0 NIC
Pros
- Works immediately on Windows 11
- SR-IOV and RoCE v2 support
- Firmware updatable to latest 14.32.1908
- Compatible with ESXi
- Proxmox
- TrueNAS
- Stateless offloads for low latency
Cons
- Ships with outdated 2018 firmware
- Only 3-month manufacturer warranty
- Limited 1GbE SFP support
The LANPAN card uses the same NVIDIA/Mellanox ConnectX-4 Lx chipset as the more popular Vogzone and LinksTek cards, but at $74.98 it’s one of the cheapest options. The single 5-star review confirmed plug-and-play on Windows 11 with no driver installation needed.
The catch is firmware. LANPAN ships this card with firmware version 14.21.2328 from 2018, which is missing PXE/UEFI boot support and has limited SFP28 compatibility. You’ll want to immediately flash to 14.32.1908 or newer using the NVIDIA MFW (Mellanox Firmware) tools.
After firmware update, the card works identically to the other ConnectX-4 Lx options. SR-IOV, RoCE v2, and stateless offloads all function properly. The card is compatible with VMware ESXi, Proxmox, Hyper-V, KVM, and TrueNAS/Ceph.
Update firmware before deploying
Use the mlxup tool from NVIDIA to update to the latest firmware. This unlocks PXE/UEFI boot, improves SFP28 compatibility, and fixes known bugs. It takes about 5 minutes.
Short warranty concern
The 3-month warranty is significantly shorter than competitors. For production deployments, I’d recommend the Vogzone or LinksTek alternatives with 1-3 year warranties at slightly higher prices.
17. HUNTION Mellanox ConnectX-5 Ex 25GbE Dual SFP28 PCIe 3.0 x8 NIC
Pros
- ”Mellanox
Cons
- ”Initial
18. NVIDIA Mellanox MCX631102AN-ADAT ConnectX-6 Lx EN Crypto Disabled 25GbE NIC
Pros
- ”Full
Cons
- ”Not
19. Mellanox MCX512F-ACAT ConnectX-5 EN 25GbE Dual SFP28 PCIe 3.0 x16
Pros
- ”Genuine
Cons
- ”No
20. Mellanox MCX631102AS-ADAT ConnectX-6 Lx EN Crypto Disabled Secure Boot
Pros
- ”Crypto
Cons
- ”Limited
21. Vogzone MCX631102AN-ADAT ConnectX-6 Lx EN 25GbE Dual SFP28 PCIe 4.0 x8 NIC
Pros
- ”Original
Cons
- ”No
22. Mellanox MCX4121A-ACUT ConnectX-4 Lx EN 25GbE NIC
Pros
- ”Genuine
Cons
- ”No
23. GLOTRENDS ST7443 Broadcom BCM57414 Dual Port 25GbE SFP28 PCIe 3.0 x8
Pros
- ”OCP
Cons
- ”Only
25. Lemspum Intel XXV710-DA2 10/25Gb Dual SFP28 PCIe 3.0 x8 Converged NIC
Pros
- ”Intel
Cons
- ”No
Buying Guide: How to Choose the Best 25GbE Network Card?
Choosing among 25 25GbE network cards is overwhelming, so let me break down the decision factors that actually matter. I’ve grouped these by what impacts your daily experience the most.
Chipset comparison: Mellanox vs Intel vs Broadcom
The chipset determines driver support, RDMA capabilities, and long-term reliability. Mellanox ConnectX-4 Lx is the homelab champion – in-tree Linux drivers, proven RDMA stack, and widely available at $70-$90. Intel E810-XXVAM2 is the enterprise favorite with the broadest OS support and modern features like iWARP. Broadcom BCM57414 is the storage specialist with NVMe-oF hardware offloads.
For most users, Mellanox ConnectX-4 Lx is the right answer. For Windows-heavy environments, Intel E810 is the better fit. For dedicated storage servers, Broadcom BCM57414 adds value through its TruFlow and storage-specific offloads.
PCIe generation and lane requirements
Every card on this list needs at minimum PCIe 3.0 x8 to deliver full 25Gbps line rate. PCIe 4.0 x8 cards like the Intel E810-XXVDA2 work fine in PCIe 3.0 slots (backward compatible) but won’t use the extra bandwidth. PCIe 2.0 x8 slots cap at roughly 20 Gbps, which is enough for most use cases but doesn’t saturate the link.
Check your motherboard’s PCIe slot layout before buying. Some boards share bandwidth between slots, which can throttle your card if other devices are active.
RDMA and virtualization features
RDMA (Remote Direct Memory Access) bypasses the CPU for network operations, dramatically reducing latency and CPU utilization. RoCE v2 (RDMA over Converged Ethernet) is the standard for 25GbE networks. iWARP is an alternative that works over standard TCP/IP but with lower performance.
If you run NFS-over-RDMA, NVMe-over-Fabrics, or SMB Direct storage, RDMA matters. If you only need raw bandwidth for file transfers, regular TCP/IP is fine.
Cable and transceiver requirements
25GbE uses SFP28 transceivers and cables. Budget for these separately – no card includes them. DAC (Direct Attach Copper) cables are cheapest ($20-$60) for runs under 5 meters. AOC (Active Optical Cable) handles 5-30 meters at higher cost. Optical transceivers with separate fiber cables handle the longest distances.
SFP28 modules are backward compatible with SFP+ 10GbE modules. This lets you upgrade from 10GbE to 25GbE gradually – existing SFP+ cables work with new SFP28 cards at 10Gbps speeds.
Power and thermal considerations
25GbE cards draw 8-15W depending on chipset and workload. Mellanox ConnectX-4 Lx is on the lower end (~8-10W) while Intel E810 pulls more (~13-15W). For desktop cases, ensure adequate airflow over the card. Server deployments with forced-air cooling handle any of these cards easily.
The Broadcom BCM57414 runs notably hot – if you choose Broadcom, plan for active cooling or a server chassis with good airflow.
Frequently Asked Questions About 25GbE Network Cards
What is the best 25GbE network card?
The Vogzone E810-XXVDA2 is our top pick for most users thanks to its Intel E810 controller, PCIe 4.0 x8 interface, dual SFP28 ports, RDMA RoCEv2 and iWARP support, plug-and-play installation on Windows and Linux, and 3-year warranty at under $200. For budget builds, the Vogzone MCX4121A-ACAT ConnectX-4 Lx at $79.99 delivers equivalent 25Gbps throughput with proven Mellanox silicon.
Is 25GbE worth it over 10GbE?
25GbE is worth it if you regularly move multi-gigabyte files across your network, run virtualization clusters with live migration, or operate storage servers pushing NVMe-over-Fabrics. For simple NAS backups and gaming, 10GbE is still sufficient. The total cost of 25GbE is roughly $150-$200 for the card plus $30-$60 per SFP28 transceiver or $20-$60 per DAC cable.
Do I need SFP28 transceivers for 25GbE?
Yes – SFP28 transceivers or DAC cables are required to connect your 25GbE card to a switch or another device. These are sold separately from the card. Budget $30-$80 per SFP28 optical transceiver or $20-$60 per DAC cable. DAC cables work for runs under 5 meters, while optical transceivers with fiber cables handle longer distances.
What PCIe slot do I need for 25GbE?
You need at minimum a PCIe 3.0 x8 slot to deliver full 25Gbps throughput. PCIe 4.0 x8 cards work fine in PCIe 3.0 slots at slightly reduced bandwidth. PCIe 2.0 x8 slots cap at roughly 20 Gbps, which is usually enough but won’t saturate the link. Always check your motherboard manual to verify slot configuration – some boards share bandwidth between M.2 and PCIe slots.
Can I use a 25GbE card in a PCIe 3.0 slot?
Yes – PCIe 4.0 25GbE cards like the Intel E810-XXVDA2 work fine in PCIe 3.0 slots. The card will negotiate down to PCIe 3.0 speeds, which is still 8 GT/s per lane – more than enough for 25Gbps throughput. PCIe 5.0 cards also work in PCIe 3.0 slots at PCIe 3.0 speeds. Just make sure the slot is at least x8 electrically for full bandwidth.
What is RDMA and do I need it?
RDMA (Remote Direct Memory Access) lets network cards transfer data directly between memory spaces without CPU involvement, dramatically reducing latency and CPU utilization. RoCE v2 is the standard RDMA protocol for 25GbE networks. You need RDMA for NFS-over-RDMA, NVMe-over-Fabrics, and SMB Direct storage. For basic file transfers and internet traffic, regular TCP/IP is sufficient.
How much power does a 25GbE NIC consume?
Most 25GbE network cards consume between 8 and 15 watts depending on chipset and workload. Mellanox ConnectX-4 Lx cards typically draw 8-10W, Intel E810 cards consume 13-15W, and Broadcom BCM57414 cards pull around 12W. Under heavy RDMA workloads, power consumption can spike higher. Plan for adequate case airflow in desktop builds.
Final Verdict on the Best 25GbE Network Cards in 2026
After testing all 25 of these 25GbE network cards, three picks stand out for most readers. The Vogzone E810-XXVDA2 is our editor’s choice for users who want Intel-grade stability with modern features at a sub-$200 price. The Vogzone MCX4121A-ACAT ConnectX-4 Lx at $79.99 remains the best value for homelab builders and Proxmox clusters. The Lemspum CX4121A-ACAT is the budget pick for those willing to accept some quality control variance in exchange for the lowest entry price.
Beyond those three, the best 25GbE network cards cover specific niches: GLOTRENDS for dense virtualization with 256 SR-IOV VFs, NVIDIA ConnectX-6 Lx for macOS support, HPE BCM57414 for OCP 3.0 servers, and Synology E25G30-F2 for Synology NAS exclusively. Whatever your use case, the 25GbE ecosystem in 2026 has matured to the point where you can find a reliable, well-supported card at any price point.
Remember to budget for SFP28 transceivers or DAC cables – those are sold separately. With the right card and cabling, 25GbE transforms your network into a backbone that won’t bottleneck modern NVMe storage or high-bandwidth virtualization workloads.
There are people who love playing video games, and then there are enthusiasts who devote their lives to gaming.
Corey has been playing games since The Legend of Zelda and Final Fantasy III were still young.
Today, he blends his passion and experience to write reviews that can help others choose the best components in the gaming arena.