ned99

I've been having a stupid time trying to get my q9550 stable at 3.4 ghz with acceptable voltages.

Right now 3.4 is stable at vcore: 1.2675 vtt: 1.25 SPP: 1.50 and NF200: 1.20 with temps of 37 idle and 55 load. From reading other peoples posts with q9550s these voltages seem a bit high to me with E0 stepping and a vid of 1.2500v. I've tried adjusting the GTLREFs but it hasn't seemed to have made much of a difference.

Do GTLREFs have any impact on the SPP voltage or only vcore/vtt? Do I just have a bad chip? Would increasing the NF200 allow me to decrease vcore, vtt, or SPP? Or are these setting fine and I should stop worrying about it?

Thanks for feedback.

DUNC4N

Your voltages aren't bad, so long as your temps aren't either.

I wouldn't mess with GTLREFs until you've reached your limit, and maybe not even then.

Try keeping your VTT close to your vcore, and give it a bump.

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Sickened1

i also have my q9550 at 3.4ghz. but my voltage is at 1.18V. try 1.2 V just to see if it works. sometimes droppin a little make it unatable but a little more will be stable.

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ned99

Are high temps the only thing that damages or decreases the longevity of CPUs through overclocking?

supaspoon

If properly tuned the gtl's can let you get away w/ slightly less vcore/vtt for the same clock.

As for your voltages, I guess it might be a little high for that clock, but really I don't see anything wrong w/ it. No 2 chips are going to be exactly the same, some will just eat some more volts than others, regardless of vid.

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l0rdmagnum

I've got a Q9550 E0 too, it's overclocked at 3.4 GHz with 1.235V (1.208 when Windows runs, 1.18V in Full).

GigaByte

What settings do you have for GTL volts? EG: "CPU REF" or "CPU GTL 0/3 REF" etc.

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ned99

I've given up trying for 3.4 for now and bumped it down to 3.2. What's really crazy is that it's rock steady at 3.2 with a vcore of 1.25 vtt of 1.20 and SPP of 1.4 with the GTLREFS left on auto. I guess 200 Mhz doesn't really make much of a difference anyway so I think I'll leave it at 3.2 and try and get the lowest voltages possible at that setting. Thanks for all the replies, I guess every chip really is different.

twisted_58

try actuall upping the fsb to 1700 or 1800, it seems that 1600 is the top of a stap on the 750i thus needing lots of volts to get stable. so jumping past that strap to the bottom of the next one would fix the need for high volts. try this:

unlink your ram and run at stock speeds
set fsb to 1800MHz

vcore: 1.27v
fsb vtt: 1.3v
spp: 1.45v
nf200: 1.3v

and all gtlvref to 50mv

then test with occt for 2hrs and up vcore as needed to pass one notch at a time. this would give you 3.82GHz. just watch temps that they don't go over 70.1*C.

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gothev

That's some voltage you are pumping into your system!

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