Form Factor Tower / 4U chassis support for max. motherboard size - 13.68' x 13' (34.7cm x 33cm), ATX, E-ATX Processor Support Supports dual, single Intel® / AMD processors Dimensions Height 437mm Width 178mm Depth 648mm Gross Weight 26.3kg Expansion Slots 7x PCI expansion slots Drive Bays Hot-swap 8x 3.5' Hot-swap SAS/SATA Drive Bays SAS or enterprise SATA HDD only recommended Peripheral Bay(s)2x 5.25' Peripheral Drive Bay 1x 5.25' Bay that fits 3.5' bay devices SAS / SATA Backplane SAS / SATA Hard Drive Backplane with SES2 Front Panel ButtonsPower On/Off button System Reset button LEDsPower LED Hard drive activity LED 2x Network activity LEDs System Overheat LED Power Fail LED Ports 2x USB Ports Power Supply with Power Distributor 920W high-efficiency (94%+) AC-DC Redundant power supplies with PMBus and I2C