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ASUS A21 White Micro-ATX Case – A21 ASUS CASE/WHT No Fan Included
₱4,300.00Original price was: ₱4,300.00.₱3,750.00Current price is: ₱3,750.00.
Brand: ASUS
Model: A21 Case (White Edition)
Form Factor: Micro-ATX, Mini-ITX Tower
BTF Compatible: Native support for ASUS hidden-connector back-plug motherboards
GPU Clearance: Up to 380 mm (Supports large high-end graphics cards)
Cooling Clearance: Up to 165 mm CPU air coolers
Radiator Support: Up to 360 mm on both Top and Front panels
Cable Management: Massive 33 mm deep routing compartment behind the motherboard
Airflow Design: 40% porous front mesh balances dust filtration and cooling
Aesthetic Detail: Color-coordinated white internal I/O cables for clean builds
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ASUS A21 White Micro-ATX Case - A21 ASUS CASE/WHT No Fan Included
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The ASUS A21 is a masterclass in Micro-ATX case design, created specifically for builders who refuse to compromise on high-end hardware just because they want a smaller footprint. By maximizing internal volume efficiency, ASUS has managed to create an mATX enclosure that comfortably houses massive 360mm radiators and giant triple-slot flagship graphics cards. This White Edition variant is heavily optimized for a clean, minimalist aesthetic, going so far as to include color-coordinated internal I/O cables to ensure your build looks immaculate from every angle.
What truly sets the A21 apart from standard cases in its bracket is its forward-looking support for ASUS BTF (Back-To-the-Future) motherboards. These hidden-connector motherboards route all power cables to the rear of the motherboard tray, completely eliminating visible cable clutter in the main chamber. Paired with a deeply accommodating 33mm cable management channel, the A21 makes building a visually flawless, high-performance rig easier than ever before.
Key Features and What They Mean
Massive Hardware Clearances in mATX
Don’t let the Micro-ATX designation fool you. With 380 mm of GPU clearance, this case can effortlessly swallow massive, modern graphics cards like the RTX 4080 or RTX 4090. Furthermore, it supports full 360mm AIO liquid coolers on both the front and the top panels, granting you the cooling capacity usually strictly reserved for large Mid-Tower or Full-Tower chassis.
BTF Motherboard Ecosystem Support
The A21 features custom cutouts on the motherboard tray specifically designed for BTF (hidden connector) motherboards. If you pair this case with a compatible BTF board, your 24-pin, EPS power, and SATA cables will all plug in from the back side of the case. This results in a phenomenally clean front chamber that looks like a custom showroom mod, achieved with zero extra effort.
33mm Cable Management Depth
One of the most frustrating aspects of building a PC is forcing the side panel shut over a nest of thick power supply cables. ASUS has allocated an incredibly generous 33 mm of depth behind the motherboard tray. Whether you are using braided cable extensions, bulky RGB controllers, or a non-modular PSU, you will have more than enough room to route, tie down, and conceal your wiring without fighting the back panel.
Competitive Positioning
In the premium mATX space, the ASUS A21 competes with options like the Fractal Design Pop Mini Air and the Corsair 4000D Airflow (which is technically an ATX case often bought for its size). The A21 distinguishes itself through sheer volume optimization. While it maintains a relatively short stature, its width and internal layout prioritize high-end cooling. The addition of the 40% porous mesh front panel ensures that it functions flawlessly as a high-airflow chassis, striking an ideal balance between trapping dust and letting RGB lighting shine through brightly.
Philippine Buyer Perspective
What Philippine Buyers Are Saying
For local system builders in the Philippines, the A21 has garnered high praise for its heavy-duty build quality (weighing in at a solid 7.3 Kg) compared to flimsy budget cases. The 40% porous front mesh is frequently highlighted in local hardware groups; users appreciate that it allows intense airflow necessary for the tropical climate while still acting as a competent dust filter. Builders executing “all-white” aesthetics especially appreciate that ASUS didn’t cut corners—the internal I/O cables are genuinely white, meaning you won’t have an ugly black USB 3.0 header cable ruining your pristine white motherboard setup.
Our Take
If you are planning an upper-midrange to high-end build and want to utilize the mATX form factor to save desk space, the A21 is a spectacular foundation. We see a lot of builders bottlenecking their thermal performance by stuffing hot components into tiny cases. The A21 solves this by allowing a 360mm top-mounted AIO alongside a massive GPU, ensuring your parts can breathe. The 33mm cable routing space is simply a godsend for clean builds.
Keep in mind that this case does not come with pre-installed fans. For local buyers, this is actually an advantage if you already plan to buy a premium set of ARGB fans (like Lian Li Uni Fans or Arctic P12s). It means you aren’t paying a premium for low-quality stock fans you were going to throw away anyway.
Known Compatibility and Setup Notes
No Pre-installed Fans: The ASUS A21 chassis is sold as a blank canvas. You must purchase your own 120mm or 140mm cooling fans or rely on your AIO liquid cooler’s fans for intake/exhaust.
Motherboard Form Factor: This case supports Micro-ATX (mATX) and Mini-ITX motherboards only. Standard ATX or E-ATX motherboards will not fit.
Radiator Thickness Warning: While it supports 360mm radiators on both the top and front, running a push/pull fan configuration on an extra-thick front radiator may encroach on your GPU clearance. For most standard AIOs (27mm-30mm thick radiators), you will have plenty of room for both.
Who Should Buy This
Enthusiasts Building “All-White” Setups who want a case where even the internal I/O headers are color-coordinated to maintain a flawless aesthetic.
Early Adopters of BTF Motherboards who want a chassis specifically cut and designed to support rear-plugging power connectors for a cable-free front chamber.
High-End Gamers Using mATX who need a compact case that doesn’t compromise, capable of fitting 380mm flagship GPUs and 360mm liquid coolers simultaneously.
Specification
Value
Brand
ASUS
Model
A21 (White Edition)
SKU
A21 ASUS CASE/WHT
Case Type
Micro-ATX Tower
Hardware Compatibility
Motherboard Support
Micro-ATX, Mini-ITX (BTF Back-Connect Compatible)
CPU Cooler Clearance
Up to 165 mm
GPU Clearance
Up to 380 mm
PSU Clearance
Up to 210 mm
Expansion Slots
5
Cooling System Support
Front Fan Support
3x 120mm / 2x 140mm
Top Fan Support
3x 120mm / 2x 140mm
Rear Fan Support
1x 120mm
Front Radiator Support
120mm, 140mm, 240mm, 280mm, 360mm
Top Radiator Support
120mm, 140mm, 240mm, 280mm, 360mm
Rear Radiator Support
120mm
Storage & I/O
Drive Bays
2x 2.5"/3.5" Combo Bay, 1x 2.5" Bay
Front I/O Interface
2x USB 3.2 Gen1 Type-A, 1x Microphone, 1x Headphone
Physical Specifications
Dimensions (W x H x D)
220 x 430 x 465 mm
Weight
7.3 Kg
Cable Management Space
33 mm depth behind motherboard tray
Packaging Weight
4 kg
Packaging Dimensions (L×W×H)
40 × 23 × 43 cm
Brand
Asus
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Product Information Notice
Specifications, images, packaging, and included accessories shown on this page are based on information published by the manufacturer and are provided for reference only. Manufacturers may revise product specifications, features, SKUs, and designs at any time and without prior notice, and actual specifications may vary between board revisions, production batches, or regional versions of the same model.
While we take care to keep our listings accurate, we recommend verifying critical specifications on the manufacturer's official product page before purchasing. If a particular specification is essential to your purchase decision or build compatibility, please confirm it with our team first and we will verify the exact unit on hand.
Product images are for illustration purposes and may differ from the actual item. If you spot an error in any listing, please let us know so we can correct it promptly.
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