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i5 2500k 4.7ghz, 1 core failing.

post #1 of 10
Thread Starter 
Hi , when using these settings on prime95 I get a quick core fail (Blend 20minutes , small fft 35minutes.
My vcore voltage hover around 1.368v to 1.384v. Do my chip need more vcore or am I doing something wrong?




Here are my OC settings.

Vrm:350
Cpu current:140%
PPL: overvoltage:enable
LLC:Ultra high
Phase control:extreme
Duty control:T.probe
Vcore: Offset + 0.010
Enhanced Intel Speedstep Technology - Enabled
Turbo Mode - Enabled
CPU C1E - Enabled
CPU C3 Report - Disable
CPU C6 Report - Disable
Vccio: 1.15v ( 1 core still fail in small FFT , so memory is not the problem? )
Ram voltage: 1.5v
PPL voltage: 1.8

Edit: Oh and btw, i'am not getting any BSOD since I have PPL overvoltage : enable and C3,c6 disable
post #2 of 10
If one core is stopping it means you need more vcore generally - last time I had a SB it took ~ 1.42v for 4.7Ghz so you might want to give it a healthy bump as long as you have good cooling.
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post #3 of 10
Thread Starter 
So all I can really do is increase my +offset and test small FFT again. Alright I will do that.
post #4 of 10
Thread Starter 
Trying with + 0.020 now , Voltage 1.382v - 1.392v
post #5 of 10
Thread Starter 
1 core still fail after 51 minutes , guess I will stick with 4.5ghz.
post #6 of 10
I stuck with 4.5Ghz in the end. The extra 200mhz wasn't worth the voltage bump & temps.
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by Arthur Hucksake View Post

I stuck with 4.5Ghz in the end. The extra 200mhz wasn't worth the voltage bump & temps.
Yeah, 0.055v+ for a 200mhz gain, that's is insane.
post #8 of 10
Might want to try lower Pll like 1.7
post #9 of 10
Thread Starter 
Quote:
Originally Posted by BiG StroOnZ View Post

Might want to try lower Pll like 1.7

And what this accomplish? Can this be related to a core failing?
post #10 of 10
Quote:
Originally Posted by tlovhak View Post

And what this accomplish? Can this be related to a core failing?

I had many instability issues when my PLL was too high, lowered it from 1.8 to 1.7 and it worked.

Have you followed the Sandy Bridge overclocking guide and used the recommended settings? I wouldn't really give up, and to be honest, for Sandy Bridge as long as your temps are in the 70's (even high 70's sometimes 80's) it's really nothing to worry about. Sure you may say it's only a 200MHz difference between 4.5 - 4.7 but, I mean I wouldn't have my overclock any other way other than 4.8GHz even if it does take 1.45v to be stable.biggrin.gif
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