ASUS · Cabinet

ASUS A21 Case

mATX / ITX · GPU up to 380 mm

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Motherboard support mATX / ITX
GPU clearance 380 mm

ASUS A21 Case is a PC cabinet that takes mATX / ITX motherboards and graphics cards up to 380 mm long.

Specifications

Key specs

Motherboard support: mATX / ITX
GPU clearance: 380 mm
Part number: 90DC00H0-B09000

Design

Type: PC
Product colour: Black
Supported motherboard form factors: micro ATX, Mini-ITX
Number of 3.5" bays: 2
Number of 2.5" bays: 1
Number of expansion slots: 5
Side window: Yes
Suitable for: Gaming
Cable management: Yes
Maximum CPU cooler height: 16.5 cm
Maximum graphics card length: 38 cm
Maximum PSU length: 21 cm

Ports & interfaces

Audio input: Yes
Audio output: Yes
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity: 2

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Cooling

Number of front fans supported (max): 3
Front fans diameters supported: 120,140 mm
Number of rear fans supported (max): 1
Rear fans diameters supported: 120 mm
Number of top fans supported (max): 3
Top fans diameters supported: 120,140 mm
Front radiator sizes supported: 120,140,240,280,360 mm
Rear radiator sizes supported: 120 mm
Top radiator sizes supported: 120,140,240,280,360 mm

Weight & dimensions

Width: 220 mm
Depth: 430 mm
Height: 465 mm
Weight: 7.3 kg

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About this product

The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management.

DISCOVER HIDDEN POTENTIAL

The ASUS A21 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly.

BROAD COMPATIBILITY

Despite being a micro-ATX case, the A21 still supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height, giving builders plenty of options to assemble their next PC.

CAPABLE COOLING

The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures.

AMPLE CABLE MANAGEMENT

The A21 provides a compartment behind the motherboard that is 33 mm wide to help you keep your wiring tucked away and tidy.

COLOR-COORDINATED BUILDS

Both variants of the A21 come with color-coordinated black or white internal I/O cables to compliment your build theme.

A21 vs similar cabinets

	ASUS A21 Case	ASUS A23 Hatsune Miku Edition	ASUS A21 ASUS CASE/BLK	ASUS A21 ASUS CASE/WHT
Motherboard support	mATX / ITX	mATX / ITX	mATX / ITX	mATX / ITX
GPU clearance	380 mm	380 mm	380 mm	380 mm
Released	—	2025	—	—

Questions about the A21

What are the main specs of the ASUS A21 Case?

mATX / ITX, GPU up to 380 mm.

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