These are Rackable Systems servers

Included is:
 1 Xeon X5675 6core Processors(can be upgraded with a second processor)
 2 copper heatsinks for processors
 7 Fans
 12GB of memory (upgradable on request)
 4 sata drive slots
 2 redundant 650 Watt power supplies
 X8DTG-DF motherboard http://www.supermicro.com/products/motherboard/QPI/5500/X8DTG-DF.cfm
   2 GigE network ports
   1 serial port (can do console redirect)
   1 VGA monitor port
   2 Rear USB Ports
   2 internal USB ports
   6 3.0Gbps SATA ports
   2 X16 PCI-E slots
   1 x4 PCI-E slot
   2 LGZ1366 sockets for processors listed above(upgrades available)
   12 Memory Slots
   IPMI 1.5/2.0 with dedicated LAN port
   more motherboard specs at SuperMicro website
 2 empty hard drive sleds
 PCI-E Power Cables for adding a GPU
 no hard drives (hard drive & OS options available, ask before paying)
 Inner rails only
 These would make great mining rigs as they have the power supply overhead and the space for a large graphics card.

Upgrades available, just ask.
Have technical questions? We have answers. 
International sales welcome to many places, please contact us for more information.

Bitcoin & Rubycoin accepted.