Quad core processor upgrade series intel xeon quad core socket socket 1366 number of processing cores 4 clock frequency 253 ghz turbo boost processor code name westmere ep tdp 80 watt stepping revision b1 stepping quickpath interface 586 gts l2 cache 4 x 256 kb l2 cache 1 024 kb l3 cache 12 kb voltage 13 v manufacturing process 32 nm suitable for hewlett packard system package lga1366 features intel ht intel vt execute disable bit sse41