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Maximum CPU Efficiency...

post #1 of 17
Thread Starter 
I just got my H80 a few days ago, and it is awesome. My WCG temps dropped almost 20 degrees Celsius from my last HSF. I had my CPU clocked at 4.0 GHz with 1.425V with 8 hours of Prime95 Large FFTs. My power draw from my UPS was ~280 watts. My max temps were 75C average, so I let it go.

Well, today I decided to down clock my CPU to 3.6 GHz and find the absolute minimum Vcore and still remain Prime95 Stable. I kept neat notes of what did and didn't work. The stock voltage of this i7 920 is 1.25V @ 2.66 GHz. I was able to increase the CPU clock speed to 3.6 GHz and actually lower the CPU voltage from stock 1.25 to 1.23125 with almost 1000 MHz gained. My power draw according to my UPS went from ~280W @ 4.0 GHz 1.425V to 216W @ 3.6 GHz 1.23125V. Load temps went from 76C average to 54C average with the reduction in CLK speed and voltage.

I'm going to see if my QPI can be lowered and hopefully maintain <200W while running WCG 24/7.

Wish me luck!

one-shot
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post #2 of 17
If your board lets you you can typically decrease CPU PLL voltage a good bit and still retain stability. QPI/DRAM voltage is also good to lower (I think what you're talking about) and the best way to test stability on that is LinX/IBT (20 passes with max memory) or prime95 blend test, not large or small fft. Another good thing to do is disable anything you're not using (Firewire, Serial/COM if present, extra SATA,, etc...) and it might drop off like 1W but still a good idea to do it anyway. DRAM voltage can almost always be decreased from the rated voltage and still be stable, you can use memtest86+ to test for stability and this will ever so slightly help too.
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post #3 of 17
Quote:
Originally Posted by one-shot View Post
I just got my H80 a few days ago, and it is awesome. My WCG temps dropped almost 20 degrees Celsius from my last HSF. I had my CPU clocked at 4.0 GHz with 1.425V with 8 hours of Prime95 Large FFTs. My power draw from my UPS was ~280 watts. My max temps were 75C average, so I let it go.

Well, today I decided to down clock my CPU to 3.6 GHz and find the absolute minimum Vcore and still remain Prime95 Stable. I kept neat notes of what did and didn't work. The stock voltage of this i7 920 is 1.25V @ 2.66 GHz. I was able to increase the CPU clock speed to 3.6 GHz and actually lower the CPU voltage from stock 1.25 to 1.23125 with almost 1000 MHz gained. My power draw according to my UPS went from ~280W @ 4.0 GHz 1.425V to 216W @ 3.6 GHz 1.23125V. Load temps went from 76C average to 54C average with the reduction in CLK speed and voltage.

I'm going to see if my QPI can be lowered and hopefully maintain <200W while running WCG 24/7.

Wish me luck!

one-shot
gl and gj so far, but this makes me smile...my 920 is running between 50 and 55 right around the 3.6GHz mark, but i'm using air cooling...just reminded me that i <3 my noctua
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post #4 of 17
Good Job! Maybe it would be helpful in the future to document settings for folks... But there are so many different setups and CPUs that it would be a huge project...

Anyway, back to home remodel work... PITA... but has to be done...

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post #5 of 17
Quote:
Originally Posted by one-shot View Post
My power draw according to my UPS went from ~280W @ 4.0 GHz 1.425V to 216W @ 3.6 GHz 1.23125V. Load temps went from 76C average to 54C average with the reduction in CLK speed and voltage.

one-shot
That's quite a great drop in temp AND power consumption for just a 400mhz tradeoff. Thanks for posting this, as this can be very useful for those interested in shaving a few dollars off their power bills and run BOINC at the same time, and lower their temps.
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post #6 of 17
Thread Starter 
I just lowered my QPI to 1.25V and finished 8 hours of Prime95 Blend. It doesn't appear to have made much of a difference to my overall power consumption. The UPS fluctuated from 211W to 216W. Oh well, time to turn more stuff off!

I did some similar testing with my old HSF, but with the H80, the CPU is able to operate at lower voltages with the same frequency.

Edit: Fluctuating from 207-216
Edited by one-shot - 10/22/11 at 10:52am
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post #7 of 17
I run Prime-95 blend and also run Heven Benchmark in a window at the same time to test things... If it does 1 hour of that, usually everything fine.

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post #8 of 17
Thread Starter 
Alright, I further lowered my QPI and PLL. I was able to lower my QPI to 1.23125V, the same as my CPU and my PLL down to 1.81V, I think. I'm going to lower them a bit more over night and see if I can get any more gains. My WCG load power draw is right at 211W-216W. Lowering the QPI and PLL didn't net in any noticeable gains.

Will post more in the morning.
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post #9 of 17
Well, I am using some crappy RAM modules now and I find that NFS 16e and QMC tunning together give the CPU/memory the best workout... better than Prime-95. If you run those two together without errors on QMC (which is super sensitive), then you got it! Had to drop my speeds again from 4GHz to 3875... see if that works. I was getting 1/3 compute errors with QMC... we will see what happens now.

It may be those 4G RAM modules are just crap.

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post #10 of 17
If you want to test voltages and memory quickly try running "y-cruncher" in stress test mode using your maximum amount of ram. Start y-cruncher and press any key, select 2 and enter, for the custom memory option select 0 and enter then enter your max amount of memory as "4G","6G","8G" etc., y will adjust to it to the max amount available.

homepage: http://www.numberworld.org/y-cruncher/

support forum: http://www.xtremesystems.org/forums/...rPi-and-PiFast

*** Be vigilant as it's a "snot kicker" (see warning on support forum)
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