U rackmount chassis 650 Watt ATX12V v2.0 EPS 12V Power supply Motherboards ATX Motherboards up to 12 x 13 3 x 5.25, 3 x 3.5External 7 x 3.5 Internal User configurable for 6x5.25 3x3.5 wout 120mm intake Fan 3x3.5Internal 7 expansion slots 1 x 120mm ba