Together with the cooling features and Quiet Computing technologies that the Performance One series is renowned for, the P193 is truly in a class all its own. 13 drive bays, 4 ext 5.25 - 1 ext 3.5- 6 3.5 int, 2 int 2.5 SSD. Cooling, 1 rear 120mm Tri Cool, 2 140mm top Tri Cool, 1 200mm side, 2 front 120mm optional. CPU cutout, 7 expansion slots, internal air filters, MOBO compatability- mini-ITX, micro-ATX, Standard ATX, Extended ATX. USB3.0/2.0.