The ASUS A21/BLK is a mid-tower case designed to house micro-ATX and mini-ITX motherboards with ease. It combines a sturdy steel frame with a tempered glass side panel, offering both durability and a clear view of your components. This case is ideal for users who want a reliable, space-efficient build without sacrificing expandability or cooling options.
Inside, the A21 provides five full-height expansion slots, giving you room to add multiple graphics cards or other expansion cards. It supports a variety of storage configurations, including one dedicated 2.5-inch drive bay and two combo bays that can hold either 2.5-inch or 3.5-inch drives. This flexibility makes it suitable for both SSDs and traditional hard drives, depending on your storage needs.
Cooling is a strong point of this case. The front and top panels can each accommodate up to three 120mm fans or two 140mm fans, and there is space for radiators up to 360mm in size, which is great for water cooling setups. The rear panel supports a single 120mm fan or radiator, helping to maintain good airflow throughout the system. This makes the A21 a solid choice for gamers or professionals who need efficient cooling for high-performance components.
The case supports graphics cards up to 380mm in length and CPU coolers up to 165mm in height, so it can handle most modern hardware without issue. Power supplies up to 210mm in length fit comfortably, allowing you to choose from a wide range of reliable units. The front I/O panel includes two USB 3.2 Gen 1 Type-A ports and separate 3.5mm audio input and output jacks, providing easy access to essential connections.
With a 33mm rear cable management compartment and compatibility with BTF hidden-connector motherboards, the ASUS A21 helps keep your build clean and organized. The tool-less side panel with tempered glass makes it simple to access your components while showcasing your build. Overall, this case is well-suited for anyone building a compact yet powerful PC, whether for gaming, content creation, or everyday use.
Highlights:
Supports micro-ATX and mini-ITX motherboards
Accommodates 360mm radiators on front and top, 120mm radiator at rear
Fits GPUs up to 380mm and CPU coolers up to 165mm tall
Front panel includes two USB 3.2 Gen 1 Type-A ports and separate audio jacks
33mm rear cable management space for tidy builds
Compatible with BTF hidden-connector motherboards
Five full-height expansion slots for versatile hardware options
Tool-less tempered glass side panel for easy access and display
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