I just OC'd my 955, all i did was UP the multiplier to 20 and up the voltage to 1.45, it worked great for about an hour, then my pc restarted during gaming and now I get blue screens. I lowered the voltage to stock, same issue, I lowered the multiplier to x18 and it seems fine. Any way I can get back to 4ghz stable?
I don't think heat is an issue, one time it blue screened around 37c and another around 47c.
1.45v probably isn't enough. I have to run at 1.467 on my 720BE X3 to run stable at 3.6GHz. Don't just up the multiplier a *** load and hope, do it a little at a time, each time testing with Prime95 or several loops of 3DMark.
you have to also remember if your only boosting you multiplier thats only your CPU. you will also want to go back and drop your multiplier and up your bus to squeze that bit that you can out of your RAM and North Bridge. Also the cooling in your case may be different than amd655's your processor fan might be the same but the air flow may be different aswell. so maybe bump your volts a bit if you still look cool under stress and see how that helps but keep and eye on those temps. after your CPU and RAM get a good tweak dont forget Afterburner/Rivatuner for your video
Sorry all got really busy, one last question if you are all still here.
I have my cpu at these settings
Bus speed 205
That gives me 3.895 MHz
I have tried to change the Multiplier to 19.5 and I crash ( blue screen Prime 95 )
If I change the bus 1 higher to 206 I get the same blue screen
and I have tried both these settings with volts all the way up to 1.550