The motherboard of the ASUS A21 PLUS model supports Micro-ATX Mini-ITX drive bays. One 2.5-inch bay Five Front I/O Ports and Two 2.5"/3.5" Combo Bay Expansion Slots One headphone One microphone Two USB 3.2 Gen1 120 mm, 140 mm, 240 mm, 280 mm, 360 mm radiator support (front) 120 mm, 140 mm, 240 mm, 280 mm, 360 mm Radiator Support (Top) Support for Radiator (Rear) 120 mm Frontal Cooling Support: 3 x 120 mm, 2 x 140 mm Support for Cooling (Top) 3 x 120 mm 2 x 140 mm Support for Cooling (Rear) 1 x 120 mm Three 120 mm ARGB fans are already installed in the front. One 120 mm ARGB fan is already installed in the rear. Maximum GPU Length: 380 mm Maximum CPU Cooler Height: 165 mm The most