I have just bought some 4GB (2x2GB) Corsair PC2-6400 XMS2 DHX RAM which is supposed to be C4 however my bios and CPUz say its timings are C5. I have never fiddled with RAM much do I just have to type in the correct timings in my BIOS? Also this RAM has 2.1v and I thought (when I built my rig several moons ago) my P5B mobo only supported 1.8v! Can anyone clue me in?