Quad core processor upgrade series intel xeon quad core package tray socket socket 2011 number of processing cores 4 clock frequency 18 ghz processor code name sandy bridge ep tdp 80 watt stepping revision m1 front side bus 3 200 mhz l2 cache 4 x 256 kb l2 cache 1 024 kb l3 cache 10 kb voltage 135 v manufacturing process 32 nm suitable for lenovo system package fclga2011 features mmx sse sse2 sse3 sse41 sse42 ssse3 advanced vector e