8 Smallest ATX Cases: Tested & Reviewed

Computer cases protect your PC components from insects and even liquid. They are manufactured to make them capable of providing good airflow throughout the computer. They also come with a cable management system and even dust filters. There are so many case options for compact computers, and the demand for this build was at its peak last year. Office workers usually use these computer cases and a dual-PC setup.

Computer cases are usually grouped into four categories based on their sizes. Small ATX cases can consume less space on your work table and still offer you the same options and features as full-size ATX cases. There is a wide variety of PC cases on the market, ranging from appearance and sizes to opportunities. Getting the ideal gaming case for your PC can be confusing, and you can’t purchase every PC case you find on the market.

This is where we step in. After intense research and analysis on the smallest PC cases, we have shortlisted the best smallest ATX cases for every need. Here are our recommendations on the best smallest PC cases:

8 Best Small ATX Cases

Quick Summary:

ImageMotherboardFeaturesPrice
Best Overall Small ATX Case
Corsair Carbide Air 540
Corsair Carbide Air 540
  • Complete side panel window
  • Liquid and air cooling
  • Alloy steel
  • Exhaust and intake fans
  • Enhanced cable mounting system
  • 2-chamber Direct Airflow Path Design

9.8
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Best Small ATX Case for Minimalist Builds
NZXT H510 CA-H510B-B1
NZXT H510 CA-H510B-B1
  • Improved cable management system containing pre-installed straps and channels
  • Tempered glass with single screw installation
  • 2 Aer F120 millimeter fans for superb internal airflow coupled with the PSU intakes and front panel containing detachable filters
  • Detachable bracket for radiators (measuring up to 240 millimeters) for easy installation
  • Front I/O USB Type-C port
  • Supports ATX, Micro ATX, and Mini-ITX motherboards
9.7
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Best Value Small ATX Case
Cooler Master HAF XB EVO
Cooler Master HAF XB EVO
  • Can support up to 4 SSDs and HDDs by detachable HDD cages
  • 2 USB 3.0 SuperSpeed ports and X dock slots in the front panel for super-fast plug and play
  • Seven expansion slots
  • Made of polymer, steel, and mesh front bezel
  • Can support CPU coolers that are 180mm in height and VGAs that are 334mm in length
  • Ideal weight for LAN gamers
9.7
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Best Budget Small ATX Case
Cooler Master MasterBox Q500L
Cooler Master MasterBox Q500L
  • Optimal thermal performance
  • Contains magnetic dust filters
  • Vertical PSU placement
  • Features a transparent acrylic side panel from edge to edge
  • Six orientation I/O panels at the top, base, right, left, and side
  • Clean space for routing.
9.6
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Best High Airflow Small ATX Case
Corsair Crystal 460X RGB
Corsair Crystal 460X RGB
  • 3 RGB SP120 fans for generating airflow
  • Supports large ATX boards and configurations for several graphic cards
  • Made of steel and tempered glass, which displays everything inside
  • Provides airflow directly to the hottest components
  • The front, top, and bottom part features a dust filter
  • Variety of cable routing options, with cable straps inclusive
9.5
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Best Looking Small ATX Case
Cooler Master MasterCase H500P
Cooler Master MasterCase H500P
  • Vertical mount for graphics card
  • Features a pair of 200mm RGB fans on the front panel for airflow
  • Features 2 USB 2.0 and USB 3.0 ports
  • RGB regulator and 1-3 splitter cable for RGB LED fans
  • Manufactured using tempered glass and steel for the side panel, steel for the body and steel mesh, and plastic for the outlook
  • Supports Micro-ATX, E-ATX, Mini-ITX, and ATX motherboards
9.4
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Best Slim Small ATX Case
Thermaltake Core G3
Thermaltake Core G3
  • A gamers’ favorite because of its lightweight
  • Compatible with every type of motherboard
  • Made of alloy steel
  • Can support a pair of 2.5 inches or 3.5 inches drives
  • A pair of USB 2.0 and USB 3.0 ports
  • A pair of pre-installed 120 mm fans for airflow
9.3
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Best Quiet Small ATX Case
Cooler Master MasterCase SL600M
Cooler Master MasterCase SL600M
  • Manufactured using aluminum paneling and smooth sandblasted finishing
  • 200mm fans for airflow and excellent thermal performance
  • Flexible top panel
  • Low noise due to design
  • Proximity sensor with lit-up ports
  • Features a rotating PCI bracket window
9.2
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Best Overall Small ATX Case

Corsair Carbide Air 540

Corsair Carbide Air 540
Source: Corsair

This PC case comes with top-notch casing technology, and it takes up a minimal amount of space on your work desk. It also has superb cooling options and helps you set up the needed components without hassle. In addition, it contains every possible solution for casing complications and helps you effortlessly achieve a clean, speedy, and appealing setup. 

Instead of opting for the standard cooling options, this PC case features a dual chamber with exhaust and intake fans to provide more ventilation to internal components such as the motherboards, CPU, and graphic cards without restraint. This translates to enhanced airflow and less noise.

Another notable feature of this PC case is its cable routing system which enables you to manage tubes and pumps in the liquid-cooling system. In addition, the Corsair Carbide Air 540 was designed to carry two cooling systems. This gives you an option to either choose your preferred cooling option or switch from one system to another without compromising replacements or aesthetics.

This small ATX case also includes PCIe installation, tool-free storage, low maintenance requirements, and fast and simple upgrading. In summary, this PC case ticks all boxes and gives you what you expect from it as the best PC case on the market. 

Best Small ATX Case for Minimalist Builds

NZXT H510 CA-H510B-B1

NZXT H510 CA-H510B-B1
Source: NZXT

NZXT has developed a reputation for being one of the best-selling PC case brands because they made their case visually appealing for game lovers. This small ATX case is available in 3 colors, which gives potential buyers some options to choose from.

Thanks to its enhanced cable management system, this product supports ATX motherboards better than other PC cases. It also has seven expansion slots. The right side of this case is made up of tempered glass and steel, while the entire body of the case has matte black coloring. Unfortunately, this PC case cannot provide sufficient airflow, which can hinder performance.

It also has a very effective cooling system: four fans (one on top, two on the front panel, and one on the backside). This gives the case superb airflow and makes it ideal for heavy operations that generate a lot of heat and are energy-intensive. You can add custom loops and water cooling systems if you’re big on temperatures and boost speeds.

Best Value Small ATX Case

Cooler Master HAF XB EVO

Cooler Master is well known for its computer cases. Unlike many PC cases, they used three materials (front mesh bezel, steel, and polymer) to manufacture their casing. The casing color is black, which makes it visually appealing to gamers. The Cooler Master HAF XB EVO dimensions are 13 x 17.4 x 16.7 inches. It features a side panel and detachable top, making it easy to swap, install or remove components from it.

There’s also a detachable tray that makes it easy to remove or install the motherboard. It supports different types of graphic cards and a variety of motherboards such as the Mini-ITX, ATX, and Micro-ATX. The top part of the casing features a large cut that makes it easy to use your preferred CPU cooler. This casing has 2 X-dock bays for easy installation or swapping of hard drives.

The selling points of this PC case are the dust-removing filters, water cooler holes, meshed front, top panel, and carrying handle. It has a good build quality, but the front panel features plastic stabs that are easily breakable. This casing is a favorite of LAN gamers because of its handles and compact build. It weighs 18 pounds, which makes it heavier than many lightweight computer casings on the market.

The Cooler Master HAF XB EVO has a different look from other PC cases because of its distinctive cube shape. In summary, this casing gives you very good value for your money and has all the options for its type of build. Although you may consider other options, this is a great all-rounder PC case if you want to go big on price.

Best Budget Small ATX Case

Cooler Master MasterBox Q500L

Cooler Master MasterBox Q500L
Source: Cooler Master

This PC case is proof that quality and performance are not measured by size. It supports standard motherboards (386 x 381mm). It also comes with entirely perforated top, bottom, and front panels to provide superb airflow for various fan configurations. In addition, it has a PSU bracket and a portable I/O that you can adjust in six various locations.

It also has a flexible frame that you can place in multiple positions to let you use the internal space the way you prefer and according to the form factor. This computer casing comes with great specifications such as rubber stompers, efficient radiators, efficient cooling, and cable management. It can support Micro-ATX, Mini-ITX, and ATX motherboards. To further embellish its appeal, it’s very affordable.

Best High Airflow Small ATX Case

Corsair Crystal 460X RGB

Corsair Crystal 460X RGB
Source: Corsair

This is another Corsair product on the list, which attests to the quality of this brand. Its tempered glass is dual-paneled and contains 3 RGB SP120 fans on the front panel. These fans generate airflow quietly and enhance the performance of this PC case. It’s available in black color, and the design is a product of exquisite engineering. Every component is placed in a visually appealing way but doesn’t hinder airflow.

The Corsair Crystal 460X RGB features seven expansion slots and can support a variety of motherboards such as the Micro-ATX, ATX, and Mini-ITX. It’s also compatible with multiple graphic cards. Because of the small build of this ATX case, there’s insufficient space for cable management. Despite having three pre-installed fans on the front panel, you can’t install 3 120mm radiators on it. Moreover, it can’t even keep lengthy power supplies.

Finally, this system doesn’t have enough bay drives. However, it’s the best airflow, and it’s quite formidable in the appearance department.

Best Looking Small ATX Case

Cooler Master MasterCase H500P

Cooler Master MasterCase H500P
Source: Cooler Master

This ATX case was initially very expensive, but the price has dropped. It offers premium performance. This PC case comes with a detachable mesh front panel and tinted tempered glass. This look isn’t just appealing, but it also enables proper airflow. The casing features CPU cutout covers, cable covers, a 360mm radiator on the front or top, and a PSU shroud. This casing can also support virtually every motherboard on the market, and that’s one edge it has over other cases.

This casing has a good cable management system, it comes with a pair of pre-installed 200mm fans, and it can support five fans (2 on top, one on the rear, and two on the front). Using e-raiser cables, you can vertically mount graphic cards (up to 412mm). It also contains a pair of slots for bay drives and nine expansion slots. This casing enables you to regulate its RGB LED lighting with its RGB controller easily.

If you’re big on appearance, this should be your go-to ATX casing. No PC case looks better. 

Best Slim Small ATX Case

Thermaltake Core G3

Thermaltake Core G3
Source: Thermaltake

This slim ATX case can be utilized for any compact form factor build. It has a black interior and exterior, and it was manufactured using steel. Because of its slim design, its rear and front side has a different appearance from the PC cases you usually see. This casing also comes with a pair of pre-installed 120mm Turbofans on the front panel. The interior of the casing also features a pair of slots for bay drives. They can support a pair of 3.5 inches drives or a pair of 2.5 inches drives.

It also features a pair of expansion slots on the rear side of its chassis and can support a dual-slot graphics card. However, it’s not compatible with multiple graphics cards. Because of its slim build, you can’t install full-size PSUs or coolers on it to avoid conflicting with the right panel. The top of this casing features mounting space for a fan, and it can support a 120mm fan, which will directly provide airflow to the graphics card.

This PC case can support multiple fans on its front panel. If you want to opt for the liquid cooling system, it can support a 240mm radiator. Thanks to its slim build, it is light and very portable. 

Best Quiet Small ATX Case

Cooler Master MasterCase SL600M

Cooler Master MasterCase SL600M
Source: Cooler Master

This PC casing was designed with top-notch aluminum, which gives it a silver exterior while the interior is black. It has a superb airflow system that can handle high-end processing units. The fans responsible for the airflow also operate quietly during heavy operations because they have been designed to operate with minimal noise. In addition, it features nine expansion slots.

It can support a pair of 3.5 inches drives and as many as eight 2.5 inches drives. It can also support a full-size CPU cooler and multiple graphics cards. The front panel is endowed with multiple high-speed ports, and they are equipped with a proximity sensor. This illuminates these USB ports when it’s dark and enables you to easily plug-in cords. It has a unique-looking chassis. In addition, it lacks a mounting space for a rear fan and a PSU remote controller.

This case is not ideal for LAN gaming, but it’s perfect for office use and heavy operations.

Our Review Process: Why You Should Trust Us

Here at OvrClock, we are committed to keeping our editorial and product recommendation processes completely independent from our monetization — so, you can always be sure we are recommending the best PC Parts for you without any partiality.

The OvrClock team has been reviewing all parts of a PC build for years now, and we use our expert opinion and experiences when making recommendations. We try to get our hands on and actually test all of the products we recommend, in addition to the dozens of alternatives that are not on the final list. This allows us to provide insights beyond what you can find from reading other online reviews, and get a true and more clear understanding of the best options. Our diverse team and vast experience also allow us to highlight each product’s ideal use cases, as well as the perfect customer profile for any given product.

For PC Cases, we test things including but not limited to: form factor, build quality, dimensions for parts clearance, parts included, RGB lighting options, and elegance, among many other factors. Our experience allows us to translate these insights into actionable conclusions and purchase recommendations for you, without you having to test all the products, or having to sift through piles and piles of data from our testing. All of the recommended small ATX PC Cases and dozens of others not in this roundup have been tested rigorously by our team and shortlisted thereafter.

For any questions about our product selection and recommendation process, feel free to contact us.

Smallest ATX Cases: Our Picks (Conclusion)

After giving you a list of the best micro-ATX cases on the market, we won’t expressly say that one system is better than the other, but there’s always a number one. 

The overall best casing is the Corsair Carbide Air 540, followed closely by the Cooler Master HAF XB EVO, and the Cooler Master MasterBox Q500L.

For the best airflow, go for the Corsair Crystal 460X RGB. If you’re big on appearance, you can get the Cooler Master MasterCase H500P. If you want a casing that’s lightweight, the Thermaltake Core G3 has got you covered. Finally, if you’re concerned about the space the system takes up, go for the NZXT H510 CA-H510B-B1.

While there may be one winner, every PC case has one unique strength that stands them out from the others. 

Best Overall Small ATX Case
Corsair Carbide Air 540
Corsair Carbide Air 540
  • Complete side panel window
  • Liquid and air cooling
  • Alloy steel
  • Exhaust and intake fans
  • Enhanced cable mounting system
  • 2-chamber Direct Airflow Path Design
Best Value Small ATX Case
Cooler Master HAF XB EVO
Cooler Master HAF XB EVO
  • Can support up to 4 SSDs and HDDs by detachable HDD cages
  • 2 USB 3.0 SuperSpeed ports and X dock slots in the front panel for super-fast plug and play
  • Seven expansion slots
  • Made of polymer, steel, and mesh front bezel
  • Can support CPU coolers that are 180mm in height and VGAs that are 334mm in length
  • Ideal weight for LAN gamers
Best Budget Small ATX Case
Cooler Master MasterBox Q500L
Cooler Master MasterBox Q500L
  • Optimal thermal performance
  • Contains magnetic dust filters
  • Vertical PSU placement
  • Features a transparent acrylic side panel from edge to edge
  • Six orientation I/O panels at the top, base, right, left, and side
  • Clean space for routing

FAQs

What differentiates Micro-ATX cases from Mini-ITX cases?

These cases vary in dimensions and PCIe slots. Micro-ATX cases contain more expansion slots than Mini-ITX casings.

How is air cooling different from liquid cooling in Micro-ATX casing?

Air cooling has to do with fans pushing out heat while the system is operating. On the other hand, liquid cooling reduces or maintains the temperature whether the system is being used or not. Liquid cooling also generates less noise than air cooling.

Is it good to have more expansion slots on the motherboard?

Yes. These slots are used for sound cards, video cards, expandable RAM modules, and wireless cards. There are different kinds of expansion slots, such as the AGP, PCI, and PCIe slots, but the PCIe slots are the best when it comes to speed.

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