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Problems overclocking Q6600+eVGA 780i

post #1 of 2
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The title says it all, I've never o/c Intel processors before, only AMD, so I followed the 780i o/c thread to the letter, except I lowered the multiplier a bit to give an initial o/c of 2.6GHz, and also dropped the CPU voltage a bit as I wasn't pushing it to anywhere near the speeds detailed in the guide. When I rebooted, it began to POST, rebooted, began to POST again (I managed to catch a glimpse of the multiplier etc in the first few lines the second time, it was running at 2.8GHz for some reason), then it rebooted again at the stock settings. However, it wouldn't boot into Windows, so I reset the BIOS to the default values, rebooted, and got the same again. Checked the BIOS and the voltages were still set manually, so I set them to auto, rebooted and it worked fine.

Any ideas where it's falling down?

*edit* I'm running the P03 BIOS update.

*further edit* I'm not necessarily sugguesting it's a fault with hardware etc either, it's quite possible I missed a setting. Would I be right in thinking that you have to derive the true FSB from the QDR, which you then multiply by the multiplier to give you the speed?

Is it possible I've hit an FSB hole? If this is the case, why the hell did it try bumping the clock speed UP on one of the failed reboots?
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Fileserver
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post #2 of 2
No, you didnt hit a hole, for the 780 they appaear much higher, mine is at 375 for example.

I would recommend first to update to the P04 bios.

Make sure in advanced settings, that the fsb/memory are unlinked.

Also, make sure c1e and speedstep are disabled.

Also, when youre first getting started, I would just use two gigs of ram at first, which brings me to another point, the first thing you should do is set the correct ram timings for your specific set of ram.

If you want, take pictures of all the advanced settings you have in the bios, memory, voltages, fsb, cpu, and head over to the 780i guide in this same forum section and post them, cause I might not come back to his, but I always check out the 780i guide, plus youll get a lot more help from others.
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