240fsb passes memtest but crashes windows.. northbridge?

[di_entropy]

was just testing my new stick of ram with memtest over night.. looped test5 for 8 hours without any errors at 240fsb, but windows bluescreens after a couple mins (although i can still pass superpi 1m).. would this mean that my NB is at its limit? i'm not sure if memtest stresses the NB or just the ram :confused:

i've still got stock abit hsf and TIM on the NB :stick: so was just wondering if i should bother taking it off and reapplying with some AS5 to help with stability (vdd set to 1.7v in bios)

thanks for any help :)

[di_entropy]

well the cpu is primestable at 11x232 which is 2552mhz.. 10.5x240 what i was testing it at is 2520mhz so i am 99% sure its not CPU

[Micutzu]

Same problem here (Abit AN7), might be the southbridge as i don't have any cooling there. 240Mhz stable, at 242mhz i loose the sound after some gaming. I can go as high as 255Mhz Prime95-stable with a single RAM stick, anything else blue-screens sooner or later.