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Bizarre 2600K Overclock Problem

post #1 of 63
Thread Starter 
I set the following OC on the build in my signature:

47X
1.39v
Load Line Calibration—Level 1
CPU PLL Overvoltage—Enabled
C1E, EIST, C3,C6, and CPU Thermal Monitor—Disabled
RAM all on Auto for now except voltage at 1.56v—my RAM specs say 1.55v

At this setting I passed 50 passes of Intel Burn Test on maximum stress. I tried Prime95 and it failed by crashing almost immediately. I increased the voltage step by step all the way to 1.42v and it still crashes.

Why would it pass one test “easily†but not even close on the other. I realize they are different tests but are they that different. What should I try at this point. I think my temps are fine and barely above 60 with the 1.42v. Should I keep increasing the CPU voltage to 1.43 or higher. Right now I am testing 46X at 1.39v just to find something that works. Are there other settings in the BIOS I should explore before raising Vcore so much?

Another thing I noticed is that when I set Vcore in the BIOS at 1.39v, in CPU-Z it is reading 1.356v. That is a large difference. Perhaps my CPU isn’t getting as much voltage as I am setting in the BIOS. Is this large discrepancy unusual?

Thanks for your help, Kent
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post #2 of 63
in case you missed it
http://www.overclock.net/intel-gener...uide-p67a.html
http://www.overclock.net/intel-cpus/...-ud4-bios.html
Edited by coolhandluke41 - 1/16/11 at 7:06am
    
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post #3 of 63
Thread Starter 
Thanks coolhandluke41. Actually this is the guide I am following. Great guide. If having problems, in step 5 Sin recommends LLC Level 2. I wonder if I should try that next. Is it safe. I am reading about some not sure if it will cause problems or not and I didn't think it would be necessary for 47X.

I could also try the following: I am just not sure how to balance this and just plain increases in Vcore.

"If not already using turbo options, please do so. Now set upper limit on TDP and TDC at 200-300 to removed TDP and TDC limitations. If your board has OCP (over current protection) you can disable this if you want a very high overclock."
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post #4 of 63
just follow his recommendations in both threads..you be fine

EDIT; i think it's all about BIOS..a lot of tinkering before oficial bios release
Edited by coolhandluke41 - 1/16/11 at 7:34am
    
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post #5 of 63
Thread Starter 
OK. Thanks again. What I am trying first is 47X with 1.43v in BIOS but reading 1.392 in CPU-Z. I will keep going higher for a while but I am not sure how high yet. If this doesn't make 47X stable in Prime95 then I will try TDP and TDC at 200-300 and/or LLC Level 2. I'm not sure which to try 1st though. Some also recommend increasing PLL voltage from the 1.8 default to 1.85 or 1.89 (Intel recommended safe limit). Sin recommends leaving this alone. So I am not sure.
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post #6 of 63
If that is the only program it is crashing in,might be bug with SB in prime95.
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post #7 of 63
Thread Starter 
Thanks Redwoodz. That is what I wondered. So I tried OCCT 3.10 and it also crashed. There is something strange with IBT on my system I guess or the pass was a fluke but I ran it for 50 passes or about 5 hours. I thought about downloading an older version of Prime95 to see if it was the 26.4 beta version that was at fault but I tried 46X at 1.39v first and Prime95 was OK for over an hour so now I feel the program is OK and that I just need more Vcore than I thought for 47X. I am using 1.43v now (CPU-Z reports 1.392v) and it has been fine for almost 1/2 hour. So fingers crossed.
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post #8 of 63
Quote:
Originally Posted by Kent10 View Post
Thanks Redwoodz. That is what I wondered. So I tried OCCT 3.10 and it also crashed. There is something strange with IBT on my system I guess or the pass was a fluke but I ran it for 50 passes or about 5 hours. I thought about downloading an older version of Prime95 to see if it was the 26.4 beta version that was at fault but I tried 46X at 1.39v first and Prime95 was OK for over an hour so now I feel the program is OK and that I just need more Vcore than I thought for 47X. I am using 1.43v now (CPU-Z reports 1.392v) and it has been fine for almost 1/2 hour. So fingers crossed.
Hey Kent, one thing you might try is to find the Linx version with the updated linpack libraries. I don't have a link, but it shouldn't be too hard to find. It should help give you a more reliable stability test.

I opened a thread over at XS about the P95 vs. Linx issue. Still no real answer as to why P95 all of a sudden stresses the Sandy Bridge harder.

FWIW, I've had 2 different mobos from two different companies (GB and Biostar) AND two different 2600Ks and the following rough guide applies to both of them:

4.7 needs approx 1.368V load
4.8 needs approx 1.404V load

I don't think most of the tools we're using (cpu-Z, linx, hwmonitor, P95, etc) are completely ready for the SB. I still use cpu-Z for example, but the software from the mobo mfgr reads the voltages off my mobo that none of the tools can (VCCsa for example).

Speaking of tools, I think there is a "Sandy Bridge Reviewers kit" floating around the net. It's a collection of the common tools, with updates.

Enjoy. :-)
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post #9 of 63
Thread Starter 
Thanks ugotd8. Very interesting. I just opened up my Easytune 6 software from Gigabyte and it reports 1.392v (same as CPU-Z) but I have it set at 1.44v in the BIOS right now. That is a huge difference. CPU-Z may not be ready for SB yet but you would think the Gigabyte software would be good???

Yes in the meantime I have read about a couple of others noticing P95 crashing while other programs did not. I wonder if something is wrong with the program and SB or if it is just more stressful. If it is just more stressful then perhaps it is a good test then.

Right now I am testing 4.7 at 1.44v. It has been running P95 for almost an hour so perhaps there is progress but I don't know how high on the voltage I want to go before I say enough is enough. Or I could try some of those other suggestion listed above but again I am not sure when to try them. I don't think I want to go too much higher on the voltage for 4.7.

Thanks again for your help.
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post #10 of 63
TBH, the prime95 thing still has me confused. On the 1366 platform, P95 with small FTTs was the basic test for stability, then to get into any clubs, you needed to pass 20+ runs of linx on max mem. Now that has completely reversed, which I find truly bizarre. I'm hoping someone knows what the hell is going on. In the meantime, I'm leaving P95 out of my stability testing. At this point, I'm basically overclocking to temp if that makes any sense.

If I can pass Linx (the latest) 50 passes with max memory, and never hit 73C then that is my 24/7 OC.

I also test with lightwave3D, I've got an image that used to take 21m to render on my OC'ed I7-920 (4.3G), now it takes 15m. That render has also crashed when I wasn't stable, so I think as long as I can pass linx and lightwave without throttling, I'm good.
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