cross posted to the AMD 965BE 4.0GHz Overclock help thread.
OK I think I'm done. I got 200 x19.5 = 3900 to work by bumping up ram to 1.9V.
I knew that I was ok at 200x19, but I felt like I was missing something. I tried 200x19.5, but prine95 eventually would crap out (like mentioned above). I looked at what other people have done and thought I'd bump up dram volts. It dawned on me to use memtest to really decide whether and/or where RAM was failing me. The 4G kingston value 1333 memory was ok at 210x19.5 in memtest running 700MHz @ 1.9v. OK, so the memory isn't what's causing me problems at 200x19.5 or 210x19 or 210x19.5. Then I tried 220x19.5 and memtest barfed right away. I next bumped up dram to 1.96v and the POST test failed...
Back to 210x19.5 to try that with windows again and didn't get far and it bsod. So then I went back to my settings for 210x19.5 ... bumped up cpu volts... vdd 1.525, vcpu 1.537. Oh crap, win 7 hated this! As it played the sound to login, it froze and the sound just stuttered for 20 seconds while it did the bsod and restart. Then scale back to 204x19.5 vdd 1.5 cpu 1.512 ... it booted but IntelBurn immediately bsod and restart.
I believe that if I had faster RAM I could try some other things and I should have bought 2x 2G ram intended for overclocking. The 4G definitely seems less robust than the same 2G. And the low-end CAD software I'm using doesn't even use 4G of ram.
And I can't help but feel that win 7 64bit is also holding me back a little ... it feels kinda picky.
So my final place is:
Bios:
200 x 19.5 @ 3900
vdd 1.485, vcpu 1.500
vDram 1.900
The highest temp during the Intel Burn was 58.5 deg C. It ran prine95 quite a while OK and is at work running it overnight. I'm pretty happy with this. Intel Burn ran 5 standard passes in 265 seconds, but was over 300 with more conservative settings. I attached the spreadsheet pic, too.
Thanks for all the info I've seen here! ... we are half tempted to take one of the P4s in the shop and seeing how high we can clock it.
Since all we're doing is running one core and can't really use much RAM. May as well run win XP and run the heatsink in the freezer.......
