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i7 975 Extreme...what am I doing wrong?

post #1 of 40
Thread Starter 
Disclaimer: I am a huge OCing noob.

I went into my BIOS on my P6T and changed the core speed multiplier to 30x. Was told by a few sources that it was a pretty safe bet for i7 975 procs to use that.

So I boot up my system, run CPU-Z and yep, my clock speed is 4ghz or so when I execute small tasks @ 30x multiplier.

I load up Autodesk Maya and launch a large render (a scene that I had prepared to evaluate the difference OCing makes for rendering 3D projects) and my render times went UP! By a lot!

Hit render again and watched CPU-Z, and indeed my clock speed was generally 2.6ghz @ 20x multiplier.

What is going wrong?

Thanks in advance.
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post #2 of 40
What do you mean, "what is wrong"?
post #3 of 40
Thread Starter 
Well if it's rendering with all cores @ 100% then why would it be dropping my multiplier down to 20x and giving me a 2.66ghz machine when it should be 30x and 4.0ghz?
I didn't watch CPU Z when rendering at stock settings, but the differences in rendering times makes sense for 3.33 (stock) vs 2.66 (when it should be 4.0ghz).

The render starts @ 30x 4.0ghz and drops to 20x 2.66ghz.
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post #4 of 40
Probably thermal issues. What cooler are you using? download real temps and report your load 100% temps as well as ambients
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post #5 of 40
unstable overclock much?
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post #6 of 40
Are you using an aftermarket cooler?

Did you increase the core voltage at all?

If you want to run 4GHz+ I would highly recommend you get an aftermarket cooler. The Intel Extreme HSF are a lot better than the normal Intel HSF but have nothing on aftermarket coolers. So that would be the first place to start.

But if you didn't increase the core voltage then its most definitely an unstable overclock. In order for your CPU to run at a higher frequency it needs more volts to power the increase in speed. Especially since you are trying to get your CPU to run 670MHz faster than stock, you definitely need to increase the core voltage from stock settings. But only do that after getting yourself an aftermarket cooler
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post #7 of 40
Thread Starter 
Using stock cooling which people figured would be fine for a 20% bump in clockspeed. I'll run the temp utility tomorrow and see what the read out is.
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post #8 of 40
Quote:
Originally Posted by kweechy View Post
Using stock cooling which people figured would be fine for a 20% bump in clockspeed. I'll run the temp utility tomorrow and see what the read out is.
Welcome to Overclock.net

the "people" told you wrong, get an aftermarket cooler, then post back here.. A good one too. Thermalright Ultra 120 Extreme, Noctua NH-D14, Prolimatech Megahalems, Corsair H70 - Google any of them

Also fill out system specs here - http://www.overclock.net/specs.php?do=addsystem


For overclocking on the 9xx i7's you can raise the bclk and use the higher multi if you run into a bclk wall. But the 9xx series generally do 200 bclk on average, so you only need a 20x multi for 4.0.
You will need to adjust voltage too, and with stock cooling its just not going to handle it...
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post #9 of 40
you're frying it to death..go use an aftermarket cooler like what other's here suggested..

Quote:
Thermalright Ultra 120 Extreme, Noctua NH-D14, Prolimatech Megahalems, Corsair H70 - Google any of them
then its not just by the multiplier you do things..you also need to raise the vcore adequate enough to sustain stability..
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post #10 of 40
Thread Starter 
Thanks very much for the replies. I'll grab a Corsair H70 today and see how it goes!
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