Supermicro 2U Rackmount Server Chassis - Black CSE-826BE16-R920LPB 2U chassis support for max. motherboard size - 13.68" x 13" and E-ATX Supports dual, single Intel/ AMD processors Expansion Slots: 7x Low-profile Full-length Expansion Slots Drive Bays: 12x 3.5" SAS/SATA Hot-swap Drive Bays Cooling System: 3x 80mm 7000RPM Chassis Middle Fans w/ Housing Power Supply: 920W 80 PLUS Platinum Certified High-efficiency (94+%) Power Supply w/ PMBus 920W Redundant High-efficiency Platinum Level (94%+) Power Supply 12x 3.5" Hot-swap SAS/SATA Drive Bays and optional 2x 2.5" ot-swap SAS/SATA Drive Bays on rear side of Chassis E16: Single Expander SAS2 backplane 3x 80mm Hot-swap Cooling Fans