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Seeking 2500k stability: late BSOD and errors...Prime95 blend

post #1 of 11
Thread Starter 
Ok i've been pretty solid @ 4.5 Ghz for months now. I play pretty demanding games...no crashes or blue screens to report. I've been inspired to try for higher. Night before last, I jacked-up my Vcore to 1.488v and tried to get 4.9 GHz. I ran 1 hr. custom blend 1 minute/6000MB no issues. Ran 20 IBT loops set to Max. Oddly it was the closest i've come to 12 hrs prime stable. After 5 hours one worker failed but the other three rolled along for another four hours. I didn't like the temps anyway, so I backed off to 4.8 ghz. and dropped to 1.47v. Again, passed one hour custom blend and 20 loops IBT. Started my Prime95 blend run...blue screen after four hours. Backed-off to 1.42v 4.7ghz @ today. Same thing. 4 hours= BSOD. I was convinced it would make it lol.

It seems that I can drown my CPU in higher than average per clock voltage and be stable in high-stress short term runs, but i'll lose a worker or blue screen after about 4 hours. Anyone have any idea what this might indicate? You guys are the experienced ones so I'm asking here if that's okay. I don't think it's heat. I only break 80c near 1.5v. I believe my H50 to be doing a good job.

So anyway, i'm working way up (more logical, eh?) from 4.5ghz this time. I'll prime it here and go from there.

To be honest, i've been overclocking for years. I've never failed Prime95 after the first hour. This is new territory for me. I kept assuming that super stress would expose the weakness but I'm obviously wrong.
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post #2 of 11
80C! have you only upped vcore? or have you tweaked anything else. im not too familiar with your ECS mobo. i wonder if it cant maintain the voltage consistently. or it could be chipset heat issues.

im running 5.0 stable with 1.47v and did prime95 for 12 hours and i have an asus sabertooth mobo. i had to change a couple extra settings in my bios too, i cant recall exactly but basically i forced my ram timings+voltage instead of auto, and basically changed anything else in the BIOS that ensured the vcore wouldnt be allowed to droop or surge. i was able to leave energy efficiency crap on too.

basically for me it was the easiest, least involved OC ive ever done. try to post your BIOS configs so others can help you better.
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post #3 of 11
I was having a core/worker fail about 8-10 hours in when trying to run at 1.34v, and bumping it up to 1.35 fixed it.
post #4 of 11
just dont push past 1.52v. youll def wear the cpu life span down just not worth it for the extra Ghz and bragging rights
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post #5 of 11
Thread Starter 
80c doesn't scare me because I know it'll never get that high during gaming. And this is only for benchmarking. I'm going back to 4.5 ghz for regular use anyway.

What I did do was drop my RAM to 1333. Stock is 1600 but I wanted to take RAM out of the equation. It's rock-solid anyway. I threw every memory test I could think of at it.

@TMallory. I know. I saw some of your posts. What scares me is how much voltage i'll need to pump up. Going from 1.34 to 1.35 is not a problem. Going from 1.48 to 1.5 is a problem.

I'm Prime-ing 4.5 @ 1.34 now. And it might not make it.

I wouldn't mind going high for just 12 hours...maybe i'll get crazy and try to go higher Vcore.

I wish PLL or some other voltage control would help, but it really doesn't. It looks to be all vcore.
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post #6 of 11
Quote:
Originally Posted by spacin9guild View Post
80c doesn't scare me because I know it'll never get that high during gaming. And this is only for benchmarking. I'm going back to 4.5 ghz for regular use anyway.

What I did do was drop my RAM to 1333. Stock is 1600 but I wanted to take RAM out of the equation. It's rock-solid anyway. I threw every memory test I could think of at it.

@TMallory. I know. I saw some of your posts. What scares me is how much voltage i'll need to pump up. Going from 1.34 to 1.35 is not a problem. Going from 1.48 to 1.5 is a problem. Reducing PLL voltage has helped a lot of users of reducing overall temps a litte, im in the process of reducing mine from 1.7v down to 1.65v.

I'm Prime-ing 4.5 @ 1.34 now. And it might not make it.

I wouldn't mind going high for just 12 hours...maybe i'll get crazy and try to go higher Vcore.

I wish PLL or some other voltage control would help, but it really doesn't. It looks to be all vcore.
Some have reported lowering PLL voltage has helped with high overclocks, drop it down to 1.75v and see what happens. I have seen people runnign 1.6v PLL, but the sweet spot seems to be between 1.7-1.75v.

Also increasing VCCIO can help with stability, max is 1.2v, however gradually take it up whilst runngin test on it.

Hope that helps
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by munaim1 View Post
Some have reported lowering PLL voltage has helped with high overclocks, drop it down to 1.75v and see what happens. I have seen people runnign 1.6v PLL, but the sweet spot seems to be between 1.7-1.75v.

Also increasing VCCIO can help with stability, max is 1.2v, however gradually take it up whilst runngin test on it.

Hope that helps
lol...I think i'm about to crap on my own board, which I love..I was glad to be @ 4.5 with a budget board. But you guys talk about PLL being 1.7-1.75v. lol...my PLL default is 1.830v. I can't set it lower. It can go higher. Up to like 2.083 or something like that. This first BIOS is a bit buggy. I'm hoping the next BIOS is better. And I'm recently discovering more things about the BIOS. I didn't see a setting to raise the BLCK at first but I found it last night buried behind hidden screens lol. I also can't go passed 50 base multi, which I didn't know. I needed to find the BLCK to get over 5Ghz because my default BLCK is 99.9. I can boot into 5Ghz (4989 MHz or whatever)...but with the BLCK set to 101 to get me officially over 5ghz...it's a no go.

So at least i'm learning more lol.
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post #8 of 11
Tbh just use your 2500k @ 4.5 Ghz, if you can keep it below 1.4v. Couple hundred Mhz increase is not worth with those voltages.
post #9 of 11
Thread Starter 
Quote:
Originally Posted by Tonza View Post
Tbh just use your 2500k @ 4.5 Ghz, if you can keep it below 1.4v. Couple hundred Mhz increase is not worth with those voltages.
Yup...true indeed. I was aiming to see how far I could push it.
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post #10 of 11
Quote:
Originally Posted by spacin9guild View Post
Yup...true indeed. I was aiming to see how far I could push it.
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Hard DriveHard DriveCoolingOS
Intel X25-M G2 80GB 3x Samsung F3 500GB RAID 0 EK Supreme HF Full Copper Windows 7 Ultimate 64bit 
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