Key Features SAS3 12Gb/s Technology 1. SAS3 12Gb/s direct attached storage HDD backplane 2. 920W Redundant High-efficiency Platinum Level Power Supplies 3. 24x 2.5" Hot-swap SAS/SATA/SSD HDD bays 4. Optional rear 2.5" HDD upgrade kit (MCP-220-82609) for mirrored OS 5. Optimized cooling w/ 3x 80x38mm hot-swap fans; optional 5x60mm middle fan kit: MCP-320-82603-0N 6. 7x Low-profile expansion slots |