Xeon E5603 is a server/workstation processor from Intel released on 14 February 2011, and it is in end-of-life production status now. It belongs to Xeon family and has a Westmere-EP architecture. This processor is built on Intel Socket 1366, and uses Gen 2 PCI express connection. 32 nm process is used in production.
Processor has 4 cores and 4 threads, with the base frequency of 1600 MHz. It has DDR3 Triple-channel memory support. As for the cache, it supports L1 64K (per core), L2 256K (per core) and L3 4MB (shared).