Hidden Connectors: ASUS A21 is compatible with BTF hidden connector motherboards to maximize clean cable management Broad Compatibility: A21 supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height Capable Cooling: The front-panel mesh is 40% porous to maximize the balance of airflow, dust filtering and RGB visibility Ample Cable Management: The A21 provides a compartment behind the motherboard that is 33 mm wide to keep your wiring tucked away and tidy Color-coordinated Builds: ASUS A21 comes with color-coordinated black or white internal I/O cables to compliment your build theme.