ThinkServer RD550 3 Yr Onsite No Operating System 1U Rack Chassis 1 x Intel Xeon E5-2620v3 (2.4GHz) 1 x 8GB DDR4-2133MHz (1Rx4) RDIMM 4 x 3.5" HS SAS/SATA Drive Bays Rear Cage: 2 x 2.5" HS SATA (Optional) AnyRAID: RAID 110i RAID Levels Supported: 0/1/10 No Drives Installed DVD RW Internal Boot: Not Installed Risers Installed: 1 Riser Card 1 x 750W Platinum Power Supply ThinkServer System Manager TSM Premium Upgrade Available AnyFabric #1 Slot: Available Onboard Video No Cable Management Arm