Key Features Chassis Type 4U Rack Enclosure Color Black Motherboard Supported up to Form Factor EATX Regular 5.25" Bays 3 Front Ports 2 USB Motherboard I/O Expansion Slots Up to 6 Intrusion Switch Yes Weight 55 lbs Power Supply 645W Cooling System 4x 5000 RPM Hot-swappable Cooling Fans Dimensions WxDxH 17.1" x 25.5" x 7" Detail Specifications Form Factor: 4U chassis support for max. motherboard size - 12" x 13" E-ATX Processor Support: Dual Xeon® 800 MHz FSB Processors Dimensions: 17.2" (437mm) x 25.5" (648mm) x 7.0" (178mm) (WxDxH) Gross Weight: 56 lbs (25.4kg) Color: Black Expansion Slots: 7x PCI expansion slots Drive Bays - Hot-swap: 8x 1" SCA Ultra320/160 Hot-swap Drives - Peripheral Bay(s): 2x 5.25" Peripheral Drive Bay , 1x 5.25" Bay For Floppy Drive SCSI Backplane: Single Channel SCSI Backplane with SAF-TE Front Panel - Buttons Power: On/Off button , System Reset button - LEDs: Power LED , Hard drive activity LED , 2x Network activity LEDs , System Overheat LED , Power Fail LED - Ports: 2x USB Ports System Cooling Fans: 4x 5000 RPM Hot-Swappable PWM Cooling Fans , Rear exhaust fans excluded (for optimized Superquiet System) System Monitoring: Chassis intrusion switch Operating Temperature Range: 10 - 35°C (50° to 95° F) Non-Operating Temperature Range: -40 - +70°C (-40° to 158° F) Humidity Range: 8 - 90% non-condensing Non-Operating Humidity Range: 5 - 95% non-condensing Power Supply: 645W Low-Noise AC power supply with PFC [ 24-pin, (4-pin, 8-pin) = 12V ]