MLJS54

Got Vcore and VTT down pretty well

But would like to further understand (more specifically, when each should be bumped) the following:

• CPU PLL
  
• QPI PLL
  
• IOH Vcore
  
• ICH Vcore

Thanks much

88EVGAFTW

I leave the first 2 alone but bump the IOH (North bridge) just a tad, about 40-60Mv when going over 3.4 Ghz. it all depends on the chip really, some people need over 100Mv+ to get to 4.0Ghz, some need less, or no bump. ICH (South bridge) not sure either, but member Patch said he found that when overclocking very high, small bumps in IOH and ICH helped stability quite a bit.

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MLJS54

Thanks --

Quick question: I did some blind testing in Vantage and noticed something similar w/r/t your point on IOH. When I did a 100mv bump, my CPU score went down from Auto 1.1v settings. I took the bump down to 50mv and my score went up. Is Vantage generally a good way to quickly test some of these settings and see if bumping/decreasing causes an improvement or should I not take the score as fact? Asking b/c I've heard the program doesn't reward a poor overclock via the CPU score.

Furthermore -- does your mobo support vdroop on/off?

88EVGAFTW

Mine supports Vdroop Compensation although I have it Off since it makes my stock 1.24Vcore jump to 1.32 in Stress Testing. I have it off, and do not need it, I have no Vdroop or Vdrop.

I would use Intel Burn Test or Linx Stresstest. Run 20 passes on Very High or a large problem size. That usually is a good way to tell if the OC is stable. 50 passes or more should be pretty damn stable.

As far as your vantage situation, I'm not sure. I don't use that to test overclocks. I usually go by the Gigaflops I get in Linx. I've omly ran Vantage or other 3dMark programs 2-3 times, just to test before and after SLI and some video card overclocks.

3dMark 06 I believe is more of a CPU test, try that.

Check this out, and the link in it
http://www.overclock.net/intel-cpus/...questions.html

And the link in my sig

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Clockadile Dundee

I use pretty much every program I can get my hands on. Diversity is important.

I agree that LinX is the fastest way to find instability.

Probably no one could have told you about the thing with IOH vCore...that is why you should use several programs.