The HP xw6400 is distinguished by what has been taken away size, power demands, heat and noise making this new mid-range workstation the ideal solution for space and power constrained environments. The HP xw6400 is distinguished by what has been taken away size, power demands, heat and noise making this new mid-range workstation the ideal solution for space and power constrained environments. Total Processors Support 2 Processor 2 x AMD Opteron 2218 Dual Core 2.6GHz Processor Technology AMD64 Technology HyperTransport Technology Cache 4 x 1MB L2 Chipset nVIDIA Memory Standard Memory 4GB Maximum Memory 64GB Memory Technology DDR2 SDRAM Memory Standard DDR2-667/PC2-5300 Signal Processing Registered Error Checking ECC Memory Slots 240-pin DIMM (8 Total) Storage Hard Drive 1 x 146GB SAS Optical Drive DVD-Writer (Double-layer) - DVD±R/±RW Controllers Controller 8-channel Serial Attached SCSI RAID Controller supporting 0, 1 RAID Level(s) Network & Communication Network 2 x nVIDIA 10/100/1000Mbps IEEE 802.3ab Gigabit Ethernet Integrated I/O Expansions Expansion Bays 2 x 5.25" External Removable Media Bay Free 1 x 5.25" External Removable Media Bay Occupied 5 x 3.5" Internal Drive Bay Total Expansion Slots 4 x PCI Express x16 Total 1 x 100MHz PCI-X Total 1 x 133MHz PCI-X Total 1 x PCI Total Interfaces/Ports Ports 1 x Mini-phone Headphone Front 1 x Mini-phone Microphone Front 2 x 4-pin Type A USB 2.0 - USB Front 1 x IEEE 1394 - FireWire Front 6 x 4-pin Type A USB 2.0 - USB Rear 1 x 9-pin D-Sub (DB-9) Serial Rear 1 x IEEE 1394 - FireWire Rear 1 x 6-pin mini-DIN (PS/2) Keyboard Rear 1 x 6-pin mini-DIN (PS/2) Mouse Rear 2 x RJ-45 Network Rear 1 x Mini-phone Audio Line-in Rear 1 x Mini-phone Audio Line-out Rear 1 x Mini-phone Microphone Rear 1 x S/PDIF Out Rear Software Operating System Windows XP Professional Power Description Input Voltage 110V AC 220V AC Input Voltage Range 90 V AC to 269 V AC Power Supply 800W