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What can I do to stabilize my OC?

post #1 of 13
Thread Starter 
Hello,

Here's the problem: I am hitting the safe temp ceiling (75 deg C) durnig Prime95 testing and my system is still unstable. Vcore has lots of room to go up but my temps are getting too high.

I am attempting to OC my i7 965 XE (note: unlocked multiplier) to 4.0 GHz. My base clock is 143 MHz, my multi is set to 28. All other voltages are still set to stock (most of them on AUTO). All I am doing is raising the vcore until I can get a stable OC. Last Prime95 test with a vcore of 1.28125 was stable for 1hr 40 min before I got the BSOD. Now I am testing with a vcore of 1.29375 and I am hitting 76 degrees. I do not want to go any hotter.

What can I do achieve a stable 4.0 GHz OC without burning out my CPU?
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post #2 of 13
Why are you getting temps that high with a watercooling setup?
Something must be wrong there.
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post #3 of 13
Thread Starter 
Quote:
Originally Posted by Cryptedvick View Post
Why are you getting temps that high with a watercooling setup?
Something must be wrong there.
Yeah, I suspect something is amiss with my WC loop. I'm trying to get to the bottom of the problem by posting in the WC section.

In the meantime, is there anything else I can tweak that would have a favorable impact on my temps? Lower the base clock, perhaps?
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post #4 of 13
What are you doing with your QPI link speed and uncore clock?

A lot of people don't set those to minimums (or close to it) causing instability at higher clocks.


Edit:
Your baseclock is tiny already, I can't see that making any difference, you could try experimenting with some different multipliers though, you could find you're more stable on a different combination (higher or lower multi) and require less voltages.
    
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post #5 of 13
Quote:
Originally Posted by Infantry1982 View Post
Yeah, I suspect something is amiss with my WC loop. I'm trying to get to the bottom of the problem by posting in the WC section.

In the meantime, is there anything else I can tweak that would have a favorable impact on my temps? Lower the base clock, perhaps?
Don't touch the bclk, just overclock using the multiplier. There is a reason you spend more money for the 956 XE. Also auto usually sets voltages way to high, set your QPI/VTT to something like 1.35 and bump it up if needed. Make sure you set your ram speed, voltage and timings too.

As stated above your temps are way to high for a water loop. Try reseting your water block. Remember though that 80 - 85 should be the max temp you see when overclocking an i7.
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by kschat View Post
Don't touch the bclk, just overclock using the multiplier. There is a reason you spend more money for the 956 XE. Also auto usually sets voltages way to high, set your QPI/VTT to something like 1.35 and bump it up if needed. Make sure you set your ram speed, voltage and timings too.
OK, got it. Quick question though. In BIOS, there is 'QPI link data rate' and then there is 'QPI/DRAM Core Voltage.' Which one are you talking about? Both are currently set to AUTO, btw.

Also, what do you mean by setting RAM speed, voltage and timings, too. I set them using the XMP tool a few months ago because they werent performing at advertised speeds.

Thanks for your help. I'll try resetting the block this weekend.
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post #7 of 13
Quote:
Originally Posted by Infantry1982 View Post
OK, got it. Quick question though. In BIOS, there is 'QPI link data rate' and then there is 'QPI/DRAM Core Voltage.' Which one are you talking about? Both are currently set to AUTO, btw.

Also, what do you mean by setting RAM speed, voltage and timings, too. I set them using the XMP tool a few months ago because they werent performing at advertised speeds.

Thanks for your help. I'll try resetting the block this weekend.
QPI link data rate is the speed at which your QPI runs, you want to set this to the lowest possible for the best stability. QPI/DRAM Core Voltage is the voltage you want to set to 1.35. The rule for this voltage is to always keep it within .5 voltages of your ram voltage which should be set to 1.65-1.66. I've never used XMP before I usually just set everything manually, especially when overclocking. In your BIOS there should be a tab for your memory, that is where you set the timings, speed and voltage for your ram. i.e. 1600Mhz 7-8-7-20 1.65
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post #8 of 13
Yea you need to reduce your QPI to the lowest value.

Along with your Uncore, reduce that to 2 times your RAM speed.

Also while OC'ing the CPU I would recommend lowering the speed on your RAM to take it out of the equation (for now). Then once you have the CPU stable bring the RAM back up then get them stable together.
    
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post #9 of 13
Quote:
Originally Posted by Crabid View Post
Yea you need to reduce your QPI to the lowest value.

Along with your Uncore, reduce that to 2 times your RAM speed.

Also while OC'ing the CPU I would recommend lowering the speed on your RAM to take it out of the equation (for now). Then once you have the CPU stable bring the RAM back up then get them stable together.
Good call, forgot to mention having uncore twice the ram. +Rep
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post #10 of 13
Thread Starter 
Thanks for the tips, I'll start working on them. Real quick tho, in my BIOS I don't see 'uncore' anywhere. However, I do see 'UCLK freq.' Is that the uncore?

BTW, regarding my temps. It looks like its the radiators. They are built for low-speed fans, hence the higher temps.
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