I've now got the cpu and ram running 1:1 but it cant bench now, blue screens. Cpu-z reads the memory at 200mhz so thats still only 400 ddr and going by the way the motherboard accepts ram frequency entered it cant use ddr 667. eg to get 200mhz you dial in 800 in the bios with the limit being 1200, so that means 667/2 =333.5 x4 (to get frequency how the bios likes it )= 1334 which is above the bios max .