Key Features 1. 920W Redundant High-efficiency 80PLUS Platinum Level (94%+) Power Supply. 2. 12x 3.5" Hot-swap SAS / SATA Drive Bays and optional 2x 2.5" Hot-swap SAS/SATA Drive Bays on rear side of Chassis. 3. 3x 80mm Hot-swap Cooling Fans. 4. 7x Low-profile PCI expansion support. 5. SAS/SATA 6Gb/s HDD backplane with SESII. 6. Mini-i-pass (SFF 8087) connectivity (multi lane).