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2500k passes small ffts but not large

post #1 of 10
Thread Starter 
I clocked the 2500k to 4.2ghz with 1.26 vcore in bios, and it passes 24 hours of Prime95 on small ffts, but only about an hour on blend. I upped the vcore to 1.28, and tried the large fft option, and it went about 4 1/2 hours before giving the same 0124 bluescreen as blend did. Is there a different voltage that needs to be adjusted? Except for some of the other ram-related voltages and cpu vcore, I have set the other voltages at their default values.

Thanks

I'm running the 1333 rated ram at stock speed and the 1.5 voltage. (It is set to 1.5 in bios, but the board in the health section says it is at 1.548).
post #2 of 10
My 1055t needs 1.5v to be stable @ 4.0ghz so I think your vcore maybe a little low.



Or is Sandy Bridge that good thinking.gif?
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post #3 of 10
Try VTT/QPI voltage (if the 2500K has it). Most likely the culprit. My gues is you'll find you'll be able to lower your vcore a bit once you find the right VTT/QPI.
post #4 of 10
Ignore Small FFTs and Large FFTs. Just focus on the Blend test. It will find your instability faster than the other tests, IBT, LinX, or OCCT.

You probably just need a bit more vCore. I found I didn't have to fiddle with VTT until I was trying a 4.8GHz overclock. Up through 4.6GHz or so, you shouldn't have to modify anything besides vCore. Make sure that PLL Overvoltage is enabled, though, as a lot of people are saying that allows higher clocks on lower voltages.

If you don't have PLL Overvoltage enabled, I'd enable that and test again. If you still 0x124, just add more vCore.
post #5 of 10
Quote:
Originally Posted by Zackcy;13025489 
My 1055t needs 1.5v to be stable @ 4.0ghz so I think your vcore maybe a little low.



Or is Sandy Bridge that good thinking.gif?

Of course it's that good.

You can't compare your AMD voltages with Intel voltages, especially 32nm Sandy Bridge voltages.

My 2600k did (waiting for RMA, my mobo killed it) 4ghz with only 1.18v.

Fully stable.
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post #6 of 10
I have always read, Large is for Mobo/RAM and Small for CPU. Have you ran Memtest?
    
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by Blacklac;13026082 
I have always read, Large is for Mobo/RAM and Small for CPU. Have you ran Memtest?

I have not run memtest, but maybe I need to.

I have run two Prime95 small fft sessions with 1.26 vcore in bios. One was just short of 24 hours, and another at 24 hours, and they both passed. I tried 4.4ghz with 1.28 in bios, and got the 0124 bluescreen almost immediately using small fft.

Blend is cycling between small and large ffts. I figured that since the small ones give me no trouble at 4.2, then just run the large option, but maybe my thinking is wrong and blend is better than large? I've seen some posts that say blend is the best option for this cpu.

Is doing anything on the computer while running blend or the large fft option actually causing it to mess up (browsing the net and watching youtube)?
post #8 of 10
I wouldn`t use th PC atall when testing. Just a temp-monotoring software if you are not shure if it gets to hot.
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post #9 of 10
On my Sandy Bridge:

- LinX 24H: pass
- Prime95 Small FFT 24H: pass
- Prime95 Large FFT 24H: pass
- Prime95 Blend 1-3H: fail

For best stability using Sandy Bridge, use Prime95 Blend test for at least 12H. I prefer 24H.

You can use your computer while running prime. Just use caution as it may crash so don't work on anything important.
Edited by compudaze - 4/6/11 at 9:01pm
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post #10 of 10
increase ram voltage.
    
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