Smallest Micro ATX Cases

When it comes to building your gaming PC, casing might be the last to ponder upon, but it is nonetheless extremely important. There are several reasons why you might choose one casing over another, and these may include style preferences, airflow, budget, size, etc. However you do it, the casing will be the cover to your book, no judging, but you still have to look good among the smallest micro ATX cases out there. It is important to keep the airflow in mind of both room and inter-build. You have to consider your room airflow, thus choosing such a casing that is suitable for the environment; if your room has got minimal air influx, then you better look for casing with proper and excellent airflow to keep things cool.

The inter-build airflow in PC case is crucial; depending on your build, you might have to look for a build that can provide efficient airflow to keep things cool, and for that matter, you might even have to add more fans to the build for which choosing the size of the casing accordingly is a necessary step. Size is one of the most important factors, which depends upon your motherboard form factor and the size of the components, including the graphics card, sometimes getting a future proof casing is also the idea, so it comes down to your preference. If either you have a cupboard size casing to ensure fitting in all future upgrades or minimalistic; we have listed all the options so you can easily select the smallest micro ATX case to satisfy your style while also being in line with your desk space.

Smallest Micro ATX Cases at a Glance:

  1. Antec Minuet 350
  2. Antec Slim VSK2000-U3
  3. CoolerMaster Silencio S400
  4. MasterBox Q300L
  5. MasterBox Q300P
  6. Corsair Crystal 280X
  7. Corsair Carbide Air 240

The Smallest Micro ATX Cases You Can Buy Today

Antec Minuet 350
Antec Minuet 350 (Image credit: Amazon)

Antec Minuet 350

Best Compact MATX Case


Motherboard Compatability: Micro ATX | Dimensions: 12.8 x 3.8 x 16.8 inches | Weight: 12.6 Pounds | I/O Ports: USB 2.0, Audio, e-SATA | Material: Paper


Super quiet Fan

Excellent Ventilation

PSU included


Cramped space for the suggested drives

The Antec minuet 350 is an elegant and compact mini-desktop Micro-ATX PC case first made available in January 2008. It is the best Compact MATX case having a very slender shape with a narrow space, making it perfect for builders who prefer smaller chassis. It comes with a three-drive bay but only allows a 5.25 and one 3.25 drive to fit in easily, which means if an internal blu-ray player or recorder is added, then there can only be a single 3.25 hard drive, skimming out other internal options for storage.

It comes with an 80 PLUS certified 350 Watt power supply with Universal Input and Active PFC. It might be small but extremely energy efficient and sits perfectly right with a powerful and power-consuming dedicated graphics card and extreme overclocking. An 8cm fan carries the air output on the side. Related: Best Mini ITX Cases This fan has a 3-step speed control attached to it. The middle setting is wonderful for even heavy processing and gaming, and it makes less noise than the CPU fan itself.

This strategy is quite impressive as the main grill sits right above the CPU socket while the long grill at the side that runs down is perfectly positioned to cool a full-length graphics card. The mirrored surface gives it a very classy and sleek look. It is one of the unique smallest micro ATX cases having connectors for E-SATA, HD Audio, and two USB ports on the front panel, making things a lot easier. The lights on the casing for power and hard drive activity are minimalistic and toned down for all good reasons.

Antec Slim VSK2000-U3
Antec Slim VSK2000-U3 (Image credit: Amazon)

Antec Slim VSK2000-U3

Best Slim Micro ATX Case


Motherboard Compatability: Micro ATX | Dimensions: 18.6 x 15.9 x 7 inches | Weight: 5.28 pounds | I/O Ports: 2 x USB 3.0, Audio In/Out | Material: Plastic, Steel


Good-looking case in a slim form factor

Neat design

Optical Drive


Requires a low-profile GPU

Standard PSU does not fit

Next in line, we have the Antec Slim VSK2000-U3, which is quite obviously slim and small, making it a perfect choice to be a subsystem-based integration and for a Micro-ATX or Mini-ITX gaming PC. It was first made available in September 2015. VSK2000-U3 is the smallest micro ATX case that can save up a lot of space on your desk with its fairly small size and vertical installation. It features three drive bays, which includes a single 5.25″ tool-less drive bay, one 3.5″ for HDD, and another 2.5″ for SSD; along with that, it supports up to four expansion slots.

Unlike the Minuet 350, the VSK2000-U3 does not include a power supply in the package. Unfortunately, The VSK2000 has no support for a standard power supply and requires a specific TFX form factor PSU. On the front panel, there are two 3.0 USB ports along with audio input/output jacks. The Antec VSK2000-U3 can easily house in a graphics card that is up to 200mm long. There is a sole 92mm temperature-controlled fan for cooling, which is a two-wire job using a Molex plug.

According to the reviews, the fan is loud, especially for an HTPC build, and should’ve been replaced with a PWM case fan for a change. The only ventilation strategy is out through the back, which can make things uncomfortably suffocating sometimes. The Antec VSK2000-U3 is the best slim micro ATX case having a very sleek and compact design, a perfect preference for an ATX or smaller chassis requiring a builder. The material used is not high-density, but it complements the overall style, giving it a classy black look, and weighs in at approximately 3.49 Kg.

CoolerMaster Silencio S400
CoolerMaster Silencio S400 (Image credit: Amazon)

CoolerMaster Silencio S400

Best Portable Smallest Micro ATX Case


Motherboard Compatability: Micro ATX | Dimensions: ‎8.27 x 16.46 x 16.06 inches | Weight: 15.4 pounds | I/O Ports: 2x USB 3.0, Audio/mic combo jack | Material: Alloy Steel


Low noise

Sleek design

Solid build quality

Reversible front door

SD card slot


Poor thermal performance

The CoolerMaster Silencio S400 is the best portable smallest micro ATX case that is designed impressively to maintain the equilibrium of quality and style. The build quality is a super solid construction of steel and plastic and comes only in black. To the side, there is a seamless tempered glass for style enthusiasts to show off the components and RGB set-up. In contrast, the side panel steel is specially designed to be sound-dampened for a perfectly stealthy performance with virtually no noise.

With its extensive housing for drives, it can easily support a single 5.25” Optical disk drive, and up to four Hard disk drives and four Solid-state drives; the housing can be shifted forwards and backward to make space for either a longer PSU or to gain additional space for a radiator, it can also be completely removed for ease of installation or if there is no need for internal storage, which seems highly unlikely. The support for cooling includes a single 120/140mm Fan on top.

The rear side supports a single 120mm fan and a radiator of the same size. The maximum size for the graphics card that can easily be adjusted is around 319mm, which is quite sufficient. At default, the Silencio S400 is the smallest mATX case that serves space for a 140mm power supply with the HDD cage at the backmost position. Still, without the radiator and HDD cage, it can easily house in a decently large 325mm power supply. The package includes dust filters for the front, bottom, and top to keep the components clean.

MasterBox Q300L
MasterBox Q300L (Image credit: Amazon)

MasterBox Q300L

Best Premium Smallest Micro ATX Case


Motherboard Compatability: Micro ATX | Dimensions: 15 x 9.05 x 15.23 inches | Weight: 1.06 pounds | I/O Ports: 2 x USB Type-A (USB 3.1 / USB 3.2 Gen 1) | Material: Acrylic


Unique filters

Easy to build inside

Great value


Acrylic windows instead of tempered glass

RGB controller comes with no instructions

The MasterBox Q300Lmight be small but excellently in functionality and provides an all-power thermal performance. The case is the best premium Smallest micro ATX case that can be placed in both vertical and horizontal positions, depending on your personal and desk space preferences, assisted by its modular I/O panel that can be easily adjusted to six different locations, including either side of the body; the I/O panel can be set up at the front, top or bottom.

The I/O panel includes two USB 3.0 ports and Audio In & Out, which supports high-definition audio. The front can carry two 140mm fans and up to a 240mm radiator for cooling support and better thermal performance. Along with support for a single 120mm fan or radiator at the rear and two 120 fans on the top, assisted with the open design of the perforated front, top, and bottom for excellent ventilation to provide maximum cooling and ensure the best performance under all circumstances.

The MasterBox Q300L is the smallest micro ATX case that allows a CPU cooler up to 159mm, a 360mm length housing for a full-length and even bigger graphics card, and a fair space of 160mm for the power supply. There is an extra 28mm clean routing space for neat cable management, right behind the motherboard tray. The housing for storage drives is relatively small but sufficient for an ATX-form factor chassis, with a single 3.5″ drive bay and a couple of 2.5″ ones. The supreme functional and high-density quality of the aesthetic design, along with the easily customizable look.

MasterBox Q300P
MasterBox Q300P (Image credit: Amazon)

MasterBox Q300P

Best Budget Smallest Micro ATX Case


Motherboard Compatability: Micro ATX | Dimensions: 15.2 x 9.1 x 15 inches | Weight: 8.43 pounds | I/O Ports: 2 x USB Type-A USB 3.1 / USB 3.2 Gen 1 | Material: Acrylic


RGB lighting

Solid construction

Clean routing space for hidden cable management

6 different locations for your modular I/O panel


Not suitable for 280mm AIOs or radiators

Acrylic windows instead of tempered glass

RGB controller comes with no instructions

The MasterBox Q300P isn’t much different from the previously suggested Q300L and this one is in primary functionality and design. But a few things give one or the other a winning edge, which can depend on personal choices, too. This is one is a bit older, as it was released back in March 2018. It’s the best budget smallest micro ATX case that has high-end flexibility for build customization, aesthetic design, and premiere functionality covers a slightly bigger dimension, and weighs around 3lbs more than its successor.

Instead of the magnetic dust filters, it offers RGB LED control, a 1-to-3 splitter cable, and four removable handles to assist mobility. It is the best small mATX case that offers pretty much the same features as its successor, with its detachable and modular I/O panel that can be adjusted to 6 different locations, including both sides of the body; the I/O panel can be set up at the front, top, or bottom. The I/O panel comprises two USB 3.0 ports and Audio In & Out, which supports high-definition audio.

For cooling support and better thermal performance, the front can carry two 140mm fans and up to a 240mm radiator, along with support for a single 120mm fan or radiator at the rear and two 120 fans on the top, assisted with the open design of the perforated front, top and bottom for excellent ventilation to provide maximum cooling and ensure the best performance under all circumstances. It features two pre-installed fans, a single 120mm to the rear, and a 120mm RGB LED fan upfront.

Corsair Crystal 280X
Corsair Crystal 280X (Image credit: Amazon)

Corsair Crystal 280X

Best Gaming Smallest Micro ATX Case


Motherboard Compatability: Micro ATX | Dimensions: 15.67 x 10.87 x 13.82 inches | Weight: 15.93 pounds | I/O Ports: 2x USB 3.0, audio/mic jacks | Material: Tempered Glass


Three tempered glass side panels

Easy hardware installation

Room for 5 fans and water cooling


No USB 3.1 Type-C

Mediocre thermal performance

Tempered glass side panel not supported

The Corsair Crystal 280X is a fantastic show of RGB lighting and aesthetic design for a premium price; however, the standard version does not include the RGB lighting at a slightly lower price. The Corsair Crystal 280x is the best gaming smallest micro ATX case that might be relatively expensive against its competitors but makes up for it with adequate functionality, enthusiastically classy design, quiet performance, and effective ventilation strategy. It has three elegant tempered glass panels, iCUE software-controlled RGB lighting, and an innovative dual-chamber. The Crystal 280X offers a paint job of two colors, black and white, to pick from.

The efficiently compact Corsair Crystal 280X offers maximum cooling for a micro ATX build, providing neat space for up to six 120mm or 140mm fans around the build (a pair of fans on each side, top, front, and back) or three radiators of 240mm, one each for the top, front and rear. The top and front of the chassis are divided into two sections, with two-thirds capped by tempered glass panels and the final third built of steel, where the I/O panel is located on the upfront side.

The I/O panel of this small form factor micro ATX case comprises two USB 3.0 ports, separate input/out audio jacks, along with power and reset buttons. This case also features a separate housing compartment for storage devices, which can hold up to three 2.5″ and two 3.5″ drive bays, in a neat package, to maintain proper management. Inside the casing, there is a dual-chamber layout, which gives space for both showing-off of components with RGB lighting and neatly managing the cables in a tight space.

Corsair Carbide Air 240
Corsair Carbide Air 240 (Image credit: Amazon)

Corsair Carbide Air 240

Best Airflow Smallest Micro ATX Case


Motherboard Compatability: Micro ATX | Dimensions: 15.63 x 10.24 x 12.6 inches | Weight: 12.4 pounds | I/O Ports: 2x USB 3.0 | Material: Steel and plastic


Near-mid tower capacity in an SFF design

Six tool-less drive bays

Excellent cable management

Large side window


Poor machining on some thumbscrew holes

Questionable sideways orientation design

The Carbide Air 240 is the best Smallest micro ATX case that is shaped like a cube, relatively smaller in height, and spacious enough to hold in large components like a dedicated graphics card or maybe even two. It has a unique design, shaped like a cube, available in both black and white, with a large and impressive full-length edge-to-edge glass panel to the side. Inside, despite the small height, it provided maximum room for large components and maximized cooling system.

These vents are covered in a metal mesh, and all of them are filtered to keep out the dust. The left chamber comprises of motherboard, CPU, and graphics card. On the other hand, the right chamber is housing a tool-less storage bay and power supply; it has a full-length vent at the lower side for the PSU and storage bays, which is capped with Corsair’s signature magnetic dust filter. The tool-less drive bay is impressive, as it is straightforward to be taken out without the need of removing any screws.

The outstanding liquid cooling support of the Carbide Air 240, allows 240mm radiators on the top, bottom, and front, assisted by the pre-spaced holes. However, with a micro-ATX motherboard with dual GPUs, you can only install a front 240mm radiator. With the promised space, the Carbide Air 240 is the best airflow Smallest micro ATX case that provides sufficient space for cooling fans, the package comes with three fans from which a pair of 120mm intakes are located at the front and a single 120mm fan up top.

Frequently Asked Questions

Is Micro-ATX smaller than Mini-ITX?

No. The Mini-ITX is the smallest Form factor. So it is smaller than Micro-ATX.

What cases can a Micro-ATX fit in?

A Micro-ATX would fit in a mid-tower ATX case and Micro-ATX case but not in a Mini-ITX case. The Lian Li 205M is a Micro-ATX case with dimensions 205 mm (W) x 415 mm (D) x 485 mm (H).

Zakriya Amir
Zakriya is right from Pakistan. He was raised with a quest for the gaming craze with an organization of specialized folks. This is the place he understood that computer games can grow your creative mind to unlimited universes. Gaming is no longer for him only a method for amusement, yet enthusiasm. From the youthful age of 8, gaming was simply the main method for communicating.