3.0C @ 3.6/3.8 slow?

daba · Post by **daba** » Sat Jul 03, 2004 4:40 am

I recently overclocked my 3.0C which was at 3.6 to 3.8 because of some new RAM I picked up. Originally at 3600Mhz I would get a horrendous Super pi score of 41 seconds with most processes disabled and super_pi.exe priority set to realtime. At 3800MHz I could run Super pi again and various other benchmarks and got the score to 39 seconds. This is very slow for a 3.6 and a 3.8. Since the system crashed with 2xPrime95 at 3800MHz, 3750MHz, and 3700MHz and wouldn't boot with 1.625Vcore, I am currently testing back at a stable 3,6GHz. Anyone know why the 3.6 is performing so poorly?

Here are Zeitgeist 2004.6's specs:

3.0C @ 3.6; Vcore 1.575
Asus P4P800 Deluxe
2x512 MB Kingston HyperX PC4000 @ 240 FSB running 1:1
ThermalTake 480W Butterfly w/ Active PFC
SP-94 w/ ThermalTake 92mm smart case fan

I originally had some HardcoreCooling.com generic cas 2.0 PC3200 (2x512 MB) running 5:4. I thought this was the root of my performance shortcomings, but apparently not. What could it be?

Thanks in advance,
daba

smb · Post by **smb** » Sat Jul 03, 2004 11:39 am

probably because you are using a P4P800. It's not PAT enabled. You need to go to Asusboards.com and look up the hack for enabling PAT. I'm using one of these baords and had the same problem till I enabled PAT. The only problem is, you can only get to 240 fsb.

daba · Post by **daba** » Sat Jul 03, 2004 4:39 pm

I'm currently at 240 FSB with no problems. I read that PAT didn't really matter. If enabling PAT allows me to run over 240 FSB, I have direct proof that such is not the case. My friend's 2,4 @ 3,4 has 283 FSB on the same P4P800 deluxe.

I should add that RAM did play a crucial role in this situation. Back when I had PC3200 I could not run any program above 3,6 GHz. With this PC4000 not only can I get into XP at 3,8 GHz, I can also run various benchmarking software (but it doesn't survive dual prime).

smb · Post by **smb** » Sun Jul 04, 2004 5:28 pm

prime is not the be all end all to stability. But, PAT does make a difference. On a P4P800 anything over 200 fsb PAT will be disabled automatically. Memory access scores go way down with PAT disabled. Read this thread for more info.
Also this one maybe there is something in there you can use.