SunFire x4100 x64 Server - 2 x 2.2Ghz dual core opteron
Specs:

2 x AMD Opteron Model 275 (2.2Ghz/1mb) Dual Core Processors
4 x 1GB ECC Memory (4gb total)
2 x 73GB 10K RPM SAS Drive
DVD-Rom
Dual redundant, hot-swapable power supplies
ILOM Service Processor
4 x 10/100/1000 Ethernet Ports
3 x USB Ports
Two internal MD2 low-profile 64-bit PCI-X slots (one at 100mhz, one at 133mhz).
Server in great condition.