Most server motherboards will take 2 processors

Intel® Xeon® Quad Core Processor E5506  LGA1366

(4M Cache, 2.13 GHz, 4.80 GT/s Intel® QPI)

Status - Launched
Launch Date - Q1'09
Processor Number - E5506
# of Cores - 4
# of Threads - 4
Clock Speed - 2.13 GHz
Intel® Smart Cache - 4 MB
Intel® QPI Speed - 4.8 GT/s
# of QPI Links - 2
Instruction Set - 64-bit
Embedded Options Available - No
Lithography - 45 nm
Max TDP - 80 W

For more information follow the following link:

http://ark.intel.com/products/spec/slbf8

 Please read the following:

The processor has been thoroughly tested and is working 100%
Do not bid if you do not intend to pay.
Bidders are responsible to insure that their motherboard can accommodate the CPU.