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2500K ASUS P8Z68-V/Gen3 G.Skill Ripjaws 1600 - Voltage Help please

post #1 of 33
Thread Starter 
I have been reading a lot of the threads on here, and I am learning a lot. I have been toying with the voltage settings to keep thermals down, but it seems I am running lower voltage than many here, which led me to think I may be doing something wrong. So here I am.

My setup is as follows:
i5 2500K
ASUS P8Z68-V/Gen3
Cooler Master Hyper 212-Plus
G.Skill Ripjaws 8GB RL 1600MHz (9-9-9-24)
Western Digital Caviar Black 1TB 32MB Sata II
OCZ ZS 650W 80Plus Bronze
Rosewill Challenger U3 case

I played with the Asus Auto-tweaker a bit but it seemed to run my voltages way higher than I need. So I started manually changing settings.

I currently have the setup overclocked at 4.7Ghz (47 X 100.0MHz), with CPU core voltage set at 1.170V, DDR at 1.50V, VCCIO at 1.0625V, CPU PLL at 1.675V and PCH at 1.05V.

At these settings the system seems stable and has been running the Prime95 blend torture test for over 2 hours with no errors. My CPU temp has been very slowly creeping up from 55C, and is currently holding steady around 62-63C (depending on the size of the FFT). CPU-Z reports Core Voltage at 1.280 to 1.296V.

Now, I'm not really sure what I should setting VCCIO, PLL and PCH to, I just sort of stumbled into these numbers after a full day of trial and error. A few of my tests along the way and the results are as follows:

1- CPU core: 1.165V, DDR: 1.50V, PLL: 1.70V, VCCIO: 1.05V, 47X 100MHz, result = BSOD.

2- CPU core: 1.170V, DDR: 1.50V, PLL: 1.70V, VCCIO: 1.05V, 47X 100MHz, result = stable, max temp = 59C.

3- CPU core: 1.170V, DDR: 1.50V, PLL: 1.70V, VCCIO: 1.05V, 48X 100MHz, result = BSOD.

4- CPU core: 1.175V, DDR: 1.50V, PLL: 1.70V, VCCIO: 1.05V, 48X 100MHz, result = BSOD after 30 secs.

5- CPU core: 1.170V, DDR: 1.50V, PLL: 1.675V, VCCIO: 1.05V, 47X 100MHz, result = Rounding Error in Prime95 after 2.5 hours

6- CPU core: 1.170V, DDR: 1.50V, PLL: 1.675V, VCCIO: 1.0625V, 47X 100MHz, result = Prime95 still running @ 2.5 hours

As you can see above, test-5 was promising, but Prime95 threw a Rounding Error after 2.5 hours. For test-6 I bumped up VCCIO from 1.05V to 1.0625V, and so far it looks like it is working, but my thermals are about 3-4 degrees higher than test-5, which was holding solid at 57-59C.

I don't really want the CPU to get much hotter than 60C, so I'm trying to keep the voltage as low as I can, but these voltages seem much lower than everyone else seems to be running, so I wonder if I'm going to have stability problems at these levels.

Please share thoughts on whether I should be worried, or if I'm doing something stupid here. If Prime95 runs without error for several hours, is that sufficient to prove it is stable, or will I start having problems later when I'm running Photoshop or Corel Video Studio?

Thanks.
post #2 of 33
BUMP they think you are a troll because you have such low voltage
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post #3 of 33
Thread Starter 
LOL!! No, I'm no troll, just a rookie trying to stabilize a new build. You can check my settings below.

Unfortunately, test-6 just failed too, this time after 236 tests in 2 hours, 40 minutes. DAMN IT!

So, does anyone have any ideas how I can get rid of this error without scaling back frequency and not driving thermals any higher?

EDIT: what should be the safe thermal level for continuous use? Am I being paranoid trying to keep this down around 60C? I read on the Intel site that the TCase limit for the i5 is 76.2C, but I am thinking I should stay well below this for longevity. Any thoughts on this?

425
Edited by PhilC2001 - 2/18/12 at 5:30pm
post #4 of 33
Just stay below 70c and you should be fine bump up voltage to 1.3v look at the voltage in CPUZ......
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post #5 of 33
Bump the vcore a bit untill you get stable. For reference Im using 1.27 for 4.5 12 hours prime blend.
We have a similar system.
I wouldnt go over 75-80c for any prolonged testing.
Edited by Munchkinpuncher - 2/18/12 at 5:47pm
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post #6 of 33
Thread Starter 
I've just downloaded RealTemp_370 and ran the senor test. However, it seems to be reporting my frequency at 103.5MHz, whereas CPU-Z and ASUS AI Suite are both reporting 100MHz.
I'm assuming RealTemp is mistaken here. Is there any way to adjust or calibrate this?
post #7 of 33
Why are you not using the bios to overclock?
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post #8 of 33
Hi PhilC2001,
+1 on bump the voltage up. You may be getting errors because your V is too low. Also I have an I7 with similar temps and Iif I remeber correctly I am running about 1.27-1.32 V. I am at 4.5ghz and stable.
Good liuck and hope this helps.
Have a great day,
preachp
    
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post #9 of 33
Thread Starter 
Quote:
Originally Posted by th3m3rc View Post

Why are you not using the bios to overclock?

Lazy, I guess. The AI suite is easier for making some of the adjustments.
post #10 of 33
Thread Starter 
Quote:
Originally Posted by PhilC2001 View Post

I've just downloaded RealTemp_370 and ran the senor test. However, it seems to be reporting my frequency at 103.5MHz, whereas CPU-Z and ASUS AI Suite are both reporting 100MHz.
I'm assuming RealTemp is mistaken here. Is there any way to adjust or calibrate this?

Late last night I think I found the cause for this. It appears the Bios settings had been set by the auto-tweaker in the Bios itself. Although the AI suite allows you to override them from the OS, it appears some tools, like RealTemp, read them directly from the Bios. I have adjusted the Bios now so it is consistent, and now RealTemp is showing the correct frequency.

However, RealTemp is still reporting temperatures readings that are way too low at default settings. I have read the material on the TechPowerUp site for calibration, but still don't know how to calibrate RealTemp to my CPU. What calibration settings are you all using?

After more research and reading, it appears many are finding that 90C is the most accurate value for TJMax on RealTemp for sandy bridge chips. I ran a little test just now and now I have reason to believe this is probably a good calibration value. My computer has been shutdown all night, so it is cool. I got a thermometer and placed it right next to the computer, it read 25.9C. I then booted the computer and immediately pulled up RealTemp and the ASUS AI suite. With RealTemp calibrated to 90C it was reporting the core temp at 27/28C, while ASUS was reporting 24/25C. I have to believe that even with the Hyper 212+ and lots of airflow that my CPU is not below ambient, so I think this calibration is most likely very close to accurate, and 27 or 28C at idle (about 2C above ambient) is probably pretty accurate.

I know, it's not the most scientific method, but for the intended purpose I think it will work, so that is what I intend to use for my monitor and testing.
Edited by PhilC2001 - 2/19/12 at 8:59am
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