multiplier of 8 not stable

[mickeddie]

If I have my FSB at 360*9 (3.24ghz) my system is prime95 stable. If I change the multiplier to 8 and have my fsb at 400 (3.2 ghz) my system is NOT prime95 stable.

Do I need to make any other changes when changing the multiplier?

 

[rwaritsdario]

FSB limitation.
What are you current voltages?

 

[fishboi]

Bottom line - P5W DH Deluxe has a FSB limit of 370Mhz, if you're using regular air cooling (cause of the high temps). You have to punch up the voltages on FSB and MCH to 1.5v and 1.65v (maximums I think) respectively, as well as the v-core to 1.5v, and then I could get this baby to work fine at 420Mhz FSB.

The huge problem with that is the high temps!! Idles in the 60s. Load = 75C+, which is dangerous. The incremental gain in CPU Mhz is not worth running at high temps and running the risk of damaging the components.

I'm a little disappointed in the P5WDH. The new 680i has high FSB limits (~500Mhz), but I've read they have even more of a temp problem, so they may not be a proper solution.

My $0.02.