This PC has been fully tested and is in perfect working order (I am a HP APS Desktop and workstation accredited engineer).
Specs are -
2 x Intel Xeon 5150 dual core CPU's (so 4 x 2.66Ghz)
4GB DDR2 PC5300 ECC RAM (4 x 1GB)
160GB WD Velociraptor 10K RPM SATA2 HDD (brand new drive, only just installed and built)
Nvidia QUadro NVS440 quad output graphics card with splitter cables (DVI or DSUB).
Motherboard has 2 x PCI-E x16 slots, so is CrossFire capable, also 2 x PCI-E x8 and 2 x PCI slots.
Windows XP Pro COA
Cosmetically it's pretty good. Some light scuff marks on the black plastic top of the chassis, but otherwise in very good condition.
Obvious a big selling point for this is the warranty, which doesn't run out till Sept 2011.
Can also provide brand new HP keyboard and mouse if needed.
For the full lowdown on this machine, see here -https://h10057.www1.hp.com/ecomcat/hpcatalog/specs/provisioner/99/RL853UC.htm
Cash on collection only from Old street, London, EC1Y.