Xeon E3-1220 is a server/workstation processor from Intel released on 3 April 2011, and it is in end-of-life production status now. It belongs to Xeon E3 family and has a Sandy Bridge architecture. This processor is built on Intel Socket 1155, and uses Gen 3, 16 Lanes(CPU only) PCI express connection. 32 nm process is used in production.
Processor has 4 cores and 4 threads, with the base frequency of 3.1 GHz. It has DDR3 Dual-channel memory support. As for the cache, it supports L1 64K (per core), L2 256K (per core) and L3 8MB (shared).