Intel Xeon E5540 socket 1366 processor.

Intel Xeon Processor E5540
(8M Cache, 2.53 GHz, 5.86 GT/s Intel QPI)

Used but in perfect working order.

http://ark.intel.com/products/37104/Intel-Xeon-Processor-E5540-8M-Cache-2_53-GHz-5_86-GTs-Intel-QPI

Collection preferred but can post at buyer's expense