ASUS A21 White Micro ATX PC Case Supports BTF Hidden Connector Technology, Graphics Cards up to 380mm, 360mm Coolers, & ATX PSUs, Includes Porous Front-Panel mesh and Cable Management Compartment
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AI Verdict
This Micro ATX case supports 380mm GPUs and 360mm radiators, ideal for compact, high-performance builds with BTF motherboards.
The ASUS A21 is a strong fit for Micro ATX and Mini-ITX builds that prioritize high-end component compatibility, like 380mm GPUs and 360mm radiators, within a relatively compact footprint. Its 33mm cable management compartment and BTF motherboard support cater to clean aesthetics.
If you need a smaller case, look for Micro ATX cases with maximum GPU lengths under 300mm and 240mm radiator support.
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Pros
- Accommodates graphics cards up to 380mm in length.
- Supports up to 360mm radiators for liquid cooling on top and front.
- 33mm wide compartment behind the motherboard for cable management.
- Front-panel mesh is 40% porous for balanced airflow and dust filtering.
- Compatible with BTF hidden connector motherboards for cleaner builds.
- Includes color-coordinated internal I/O cables to match the case color.
Cons
- Does not include any pre-installed fans, requiring separate purchase.
- Lacks a front panel USB Type-C port.
- Larger physical footprint than some other Micro ATX cases.
- Material specifications beyond tempered glass and mesh are not detailed, suggesting basic construction for the price point.
Dimension Scores
The 40% porous front panel, support for 3x120mm fans front/top, 360mm radiators, 380mm GPUs, and 165mm CPU coolers indicate high performance potential.
No included fans mean noise depends entirely on user-chosen components, and no specific dampening features were highlighted in reviews.
It features a tempered glass side panel and magnetic dust filters, but the general material is unspecified, aligning with an entry-level price point.
The 33mm cable management compartment, BTF compatibility, color-coordinated cables, and user reports of 'super-easy' cable management are excellent.
Best For
- Builders creating compact gaming PCs with large GPUs.
- Systems utilizing 360mm AIO liquid coolers.
- Users prioritizing clean aesthetics with BTF hidden connector motherboards.
- New builders due to generous internal space and cable management options.
Not Recommended For
- Full ATX motherboard users.
- Users expecting included cooling fans out of the box.
- Builders requiring a front panel USB Type-C connection.
Watch Out For
- No included fans means an additional purchase of 3-6 fans (120mm or 140mm) is necessary for optimal cooling.
- The case is physically larger than some Micro ATX alternatives, potentially taking up more desk space.
- Only supports horizontal GPU mounting, requiring a GPU bracket for larger cards to prevent sag.
Full Specifications
| ASIN | B0CPP58899 |
| Brand | ASUS |
| Color | A21 ASUS CASE/WHT |
| Series | A21 ASUS CASE/WHT |
| Fan Size | 120 Millimeters |
| Material | not specified or unknown |
| Case Type | Mid Tower |
| Model Name | A21 ASUS CASE/WHT |
| Item Weight | 18.5 pounds |
| Manufacturer | ASUS |
| Cooling Method | Air |
| Item model number | 90DC00H3-B08000 |
| Product Dimensions | 19.49 x 11.42 x 20.35 inches |
| Item Dimensions LxWxH | 19.49 x 11.42 x 20.35 inches |
| Number of USB 2.0 Ports | 2 |
| Number of USB 3.0 Ports | 2 |
| Motherboard Compatability | Micro ATX |
| Power Supply Mounting Type | Internal |
| Recommended Uses For Product | Gaming |
What Buyers Say
Many users highlight the surprisingly generous space for components like 380mm GPUs and 360mm AIOs within its Micro ATX form factor, making it suitable for powerful builds. The cable management features, including a 33mm compartment and BTF motherboard compatibility, are consistently praised for making builds clean and easy. However, the absence of included fans is a recurring point, meaning users need to factor in additional fan purchases for cooling.
“Dude, this case is way bigger than I thought for mATX but it swallowed my huge GPU and AIO no problem, and the cable routing was actually kinda fun for once. Just remember to buy some fans, seriously.”
Common Praise
- Fits large graphics cards up to 380mm without issue.
- Ample space for 360mm liquid cooling radiators on top and front.
- 33mm cable management compartment makes routing wires easy and tidy.
- BTF hidden connector motherboard compatibility simplifies internal wiring.
- Front panel is 40% porous mesh, providing good airflow.
- Easy to build in, even for new builders.
Common Complaints
- No fans are included, requiring separate purchase.
- Lacks a front panel USB Type-C port.
- Larger than some other Micro ATX cases, potentially impacting desk space.
- Only supports horizontal GPU mounting, potentially needing a support bracket for heavy cards.
Ownership Tips
- The magnetic dust filters on the top and bottom are easy to remove and clean.
- The thumb screws for side panels are convenient and prevent losing screws.
- The case feels sturdy despite the entry-level price point.
- The white internal I/O cables really do blend in well with a white build.
Frequently Asked Questions
Does this case come with fans?
No, the ASUS A21 does not include any pre-installed fans, so you will need to purchase them separately for cooling.
What size graphics cards can fit?
The case supports graphics cards up to 380mm in length.
Can I install a liquid cooler?
Yes, it supports up to 360mm radiators on both the front and top panels, and a 120mm radiator at the rear.
Is it easy to manage cables?
Yes, it has a 33mm wide compartment behind the motherboard tray and color-coordinated internal I/O cables to help with tidy wiring.
What motherboard sizes are compatible?
It is compatible with Micro ATX and Mini-ITX motherboards.
Does it have a USB-C port on the front?
No, the front I/O panel includes two USB 3.2 Gen1 ports, a microphone jack, and a headphone jack, but no USB Type-C.
Buying Guide
When picking a PC case, you're balancing component compatibility, cooling potential, and how easy it is to build in. For a Micro ATX case like this, you need to make sure your motherboard fits, but also consider if your graphics card and CPU cooler (especially if it's a large liquid cooler) have enough room. Good cable management makes a huge difference for both aesthetics and airflow.
Motherboard Compatibility (Micro ATX)
This means it fits smaller motherboards, which are great for more compact builds, but you can't use a full-sized ATX motherboard.
Max GPU Length (380mm)
This is how long your graphics card can be. 380mm is quite generous, meaning it can fit almost all high-end GPUs without issues.
Radiator Support (360mm)
This refers to the size of liquid cooling radiators it can accommodate. A 360mm radiator is a large size, offering excellent cooling for powerful CPUs.
Cable Management Compartment (33mm)
This is the space behind the motherboard tray for routing cables. 33mm is a lot of room, making it easy to hide wires and keep your build looking clean.
Alternatives
If this case is too large or you need a front USB-C port, look for Micro ATX cases that specify a smaller footprint and include a USB Type-C port on the front I/O.
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