Mfr Part Number: SR10769-BK-T M/B form factor: Extended ATX (12 x 13) CPU Type: Intel DP Nocona/ Xeon; AMD Opteron/ Athlon Dimension (DxWxH): 620.0 x 220.0 x 425.0 mm ; 24.4 x 8.7 x 16.7 inch Drive Bays: External Bays: 3 x 5.25 ; 1 x 3.5 Hot-swap: 8 x 3.5 Backplane: Ultra320 SCSI; serial ATA Switches/ Controls: Power; Overheat & Reset; Alarm Mute Indicators: Power; HDD/LAN Activity; Overheat & Fan Failure Slot Openings: 7 Cooling Fan: Middle Fan: 2 x 120 mm Rear Fan: 1 x 120 mm Front Panle I/O: 2 x USB 2.0 Security Lock: Kensington Lock; Key Lock & Intrusion Switch Kensington Lock: Yes Construction Material: SECC Sheet Metal Thickness: 1.0 mm Plastic Material Type: ABS-HB Option 1) Redundant Zippy Power Supply 650W PS-MRM-650/PS-MRM6650PH-7 Option 2) Hot Swap HDD Cage w/ SATA II / SAS BP& 80mm CA-107SA-2/84H210710-045