Quad core processor upgrade series intel xeon quad core socket socket 1366 number of processing cores 4 clock frequency 28 ghz turbo boost processor code name nehalem ex tdp 95 watt stepping revision d0 stepping quickpath interface 64 gts l2 cache 4 x 256 kb l2 cache 1 024 kb l3 cache 8 kb voltage 135 v manufacturing process 45 nm suitable for hewlett packard system package lga1366 features enhanced halt state c1e intel ht intel vt exe