I remember you having problems with 2.50A thats why I asked if hes tried using 2.40B instead. For one reason or other my board has no issues with 2.50A nor does it seem to need alot of extra voltage, 1.40mch for 4.5/1250. 2.40B on the other hand has always had issues with how much mch voltage it can handle at a given fsb before it will bsod or just not boot. Where your able to run 1.46+mch for 500x9 I cant go over 1.40 on 2.40B without have problems, 1.42 is kinda usable but 1.44+ will crash instantly or not boot at all. Theres a narrow usable window on how much mch voltage is needed to be stable yet not crash from having to much voltage and this scales with fsb, as it increases so can mch as it deceases so must mch or it becomes unstable. This is using the red slots, if I use the yellows the max usable mch voltage drops by about 0.02-0.04 (to about 1.36-38 at 500fsb).