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I'm trying to oc my e6600/P5B Dlx rig to 333fsb. All is fine at 300 and 320, but when I go up to 333 I start getting rounding errors when running Prime95 LARGE FFT test. The SMALL FFT test runs fine for hours with no errors.<br><br>
Here are my settings...<br><br>
FSB = 333<br>
DRAM = 666<br>
PCI = Locked @ 33.3<br>
PCIE = Locked @ 100<br>
Spectrum Spread = DISABLED<br>
CPU Core V = Tried between 1.3 and 1.35<br>
DRAM Timing = 5-5-5-15<br>
Static Read Control = Tried both AUTO and DISABLED<br><br>
Am I correct in assuming that since only the Large FFT test fails my issue probably lies with memory? My ram is Corsair Twin2X DDR 800 5-5-5 (2gb, 1gbx2) I've noticed that other here have been using SPECTRUM SPREAD set to AUTO. Should i try that?<br><br>
Also, what about increasing the voltage to my VCore? I've only gone as high as 1.35 since my cpu tends to run a little hotter than the average 6600.<br><br>
Thanks
 

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Originally Posted by <strong>spiderhole</strong>

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<div style="font-style:italic">I'm trying to oc my e6600/P5B Dlx rig to 333fsb. All is fine at 300 and 320, but when I go up to 333 I start getting rounding errors when running Prime95 LARGE FFT test. The SMALL FFT test runs fine for hours with no errors. <br />
<br />
Here are my settings...<br />
<br />
FSB = 333<br />
DRAM = 666<br />
PCI = Locked @ 33.3<br />
PCIE = Locked @ 100<br />
Spectrum Spread = DISABLED<br />
CPU Core V = Tried between 1.3 and 1.35<br />
DRAM Timing = 5-5-5-15<br />
Static Read Control = Tried both AUTO and DISABLED<br />
<br />
Am I correct in assuming that since only the Large FFT test fails my issue probably lies with memory? My ram is Corsair Twin2X DDR 800 5-5-5 (2gb, 1gbx2) I've noticed that other here have been using SPECTRUM SPREAD set to AUTO. Should i try that?<br />
<br />
Also, what about increasing the voltage to my VCore? I've only gone as high as 1.35 since my cpu tends to run a little hotter than the average 6600.<br />
<br />
Thanks</div>

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</div>Have you increased the Northbridge MCH voltage any? You will need to for high fsb.
 

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Increase northbridge MCH voltage? But how will you measure if that is stable or running too hot. Sounds risky.
 

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The asus probe utility tells you the mb temp<br />
<br />
It's not risky, but better temps will hit better fsb typically<br />
<br />
You add voltage until it's no more benifit from it.
 

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I see. What a safe mobo temp then? And the best Prime95 test to see if its all stable, CPU/Mobo? I use torture test.
 

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Asus probe sets off bells and whistles if it goes over 45c
 

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Increase the FSB termination voltage and the NB voltage up one notch and try again.
 

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Originally Posted by <strong>OCZedd</strong>

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<div style="font-style:italic">I see. What a safe mobo temp then? And the best Prime95 test to see if its all stable, CPU/Mobo? I use torture test.</div>

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</div>lol, a pc here at school runs at 65C all day with no probs.. yes that's right, the mobo. The cpu (p4 2.8) runs even at 72-75C idle (up to 85C load <img src="/images/smilies/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg" />)<br />
That's also some ASUS board, so I'd guess it's fine..
 
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