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Worker #3, why you failing me? (i5 750)

post #1 of 38
Thread Starter 
Hi guys.

Lately I've been trying to overclock my i5-750. It's been going good and all. But everytime I get above 3,78 GHz core 3 seems to fail on Prime95 no matter what voltage I use. It's always core 3.

My current settings:
211x19
VCore: 1.375V (1.36V in CPU-Z)
VTT: 1.35V
PLL: 1.878V
PCH: 1.1V

Temperatures in mid 60s when running Prime95. Passed 15 runs of IntelBurnTest, worker #3 failed after 8 minutes in Prime95.

What am I doing wrong? More voltage needed? confused.gif

Thanks in advance!
    
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post #2 of 38
Usually a worker failing is the sign of it needing a bit more voltage - try something small like 1.3825
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post #3 of 38
I'm not so sure you want more voltage. 1.375 is a little much for a 3.8/4.0 Ghz overclock.

Your ratio looks a little bizarre to me. I think 211 might be an overambitious BCLK; you should be able to get a stable OC with a base of 200 and multis of 19 or 20 (depending on target speed).

Check what voltages are required to get that OC stable, and then push for a higher BCLK if there's room in the voltage specs biggrin.gif
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post #4 of 38
First off, you should back your PLL down to 1.8v. I've never seen increasing PLL benefit anything. In fact, lowering the PLL slightly may be better.

Next, are you failing blend test or small FFT? If small FFT fails, you probably need more CPU vcore. If blend test fails (specifically one worker) adding more/less CPU VTT will probably fix the problem. Maybe increase the PCH voltage a little, up to 1.15v.
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post #5 of 38
Thread Starter 
Quote:
Originally Posted by beoagate;12561492 
I'm not so sure you want more voltage. 1.375 is a little much for a 3.8/4.0 Ghz overclock.

Your ratio looks a little bizarre to me. I think 211 might be an overambitious BCLK; you should be able to get a stable OC with a base of 200 and multis of 19 or 20 (depending on target speed).

Check what voltages are required to get that OC stable, and then push for a higher BCLK if there's room in the voltage specs biggrin.gif

Exactly what I was thinking. I also seemed to be able to get 3.6 GHz at like 1.27V so..
Alright, trying Prime95 at 200x20 now.
Quote:
Originally Posted by Dopamin3;12561668 
First off, you should back your PLL down to 1.8v. I've never seen increasing PLL benefit anything. In fact, lowering the PLL slightly may be better.

Next, are you failing blend test or small FFT? If small FFT fails, you probably need more CPU vcore. If blend test fails (specifically one worker) adding more/less CPU VTT will probably fix the problem. Maybe increase the PCH voltage a little, up to 1.15v.

PLL can't actually go as low as 1.8V, the standard is 1.854V on my motherboard. It will only go as low as 1.812V

I'm running blend tests. But isn't 1.354V VTT already a bit high? Tried increasing the PCH up to 1.15V, let's see how I do.

Could I mega fail ram be limiting me? (1066/CL7 - Current: 1200/CL9)
    
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post #6 of 38
Thread Starter 
Worker 3 stopped after 7 hours in blend test. More vcore or should I try bumping the VTT/PCH?
    
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post #7 of 38
try lowering your vtt. I only need 1.24 vtt with 4.0ghz and ram clocked at 1520mhz while it's only rated 1333.

a vtt of 1.30 or higher makes the same oc unstable for me, also failing prime after hours, and always on the same core. Only after lowering vtt to 1.24 did I get it 24hrs stable.

Just a heads up...
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post #8 of 38
Thread Starter 
Quote:
Originally Posted by genuine555;12572322 
try lowering your vtt. I only need 1.24 vtt with 4.0ghz and ram clocked at 1520mhz while it's only rated 1333.

a vtt of 1.30 or higher makes the same oc unstable for me, also failing prime after hours, and always on the same core. Only after lowering vtt to 1.24 did I get it 24hrs stable.

Just a heads up...

Lowered to 1.25, failed IBT after 2 min.

Upped again to 1.294, ran stable Prime95 for 13 hours but then worker 3 stopped again. The other cores ran for 17 hours before I stopped them.

God damn it! Any ideas? mad.gifconfused.gif
    
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post #9 of 38
Quote:
Originally Posted by Xylian;12583437 
Lowered to 1.25, failed IBT after 2 min.

Upped again to 1.294, ran stable Prime95 for 13 hours but then worker 3 stopped again. The other cores ran for 17 hours before I stopped them.

God damn it! Any ideas? mad.gifconfused.gif

Ok, that's a good sign. That means 2.9 is about 12h and 58min more stable then 1.24, but 1.35 as you started out with is too high.
Too much OR too little vtt can cause instability, unlike vcore.

So I'd try 1.31 and stress again. Finding the right settings can be time consuming, but they are there to be found.

PCH should remain at default setting (on my mobo it's 1.05) no need to bump this at all.
PLL also keep at lowest possible setting.you won't find any stability gain in bumping this.

what voltage and speed is your mem set at ?
Edited by genuine555 - 3/2/11 at 12:08pm
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post #10 of 38
Thread Starter 
My ram are 1.5V rated from Kingston. They're at 1.559V atm, that was the standard.
They're 1066 MHz CL7 (7-7-7-20). Ran them as 1200 MHz CL9 (9-9-9-27) for the stress test. Could probably tighten the timings, but I'd like to keep them out of the equation right now.

Getting new 2250 MHz CL9 ram in a few days though.

I'll try 1.31V for tonight then!

Appreciate your help, +rep
    
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