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BSOD after 8.5 Hours of Prime95 Blend...what to do? - Page 2

post #11 of 23
Quote:
Originally Posted by 996gt2;13760544 
Thanks for the suggestions. I will boost the vcore a bit.

Here's the issue with VCCSA though. When I go a bit higher than 4.4 (say, 4.6), my system will not even boot into BIOS with the VCCSA set at 0.920V, but it boots into Windows perfectly fine with the VCCSA boosted up a bit to say 0.955V. Intel's max is 0.975V I believe, so 0.955 is still within that range.

Any idea why boosting the VCCSA and not changing anything else would have such a big effect?

VCCSA is the system agent voltage I find it weird that it has that effect for you.

If you can't boot higher than 4.4 do this:

Enable CPU PLL Voltage Override (most probable culprit)
Current Max Amp: 150 amps
Power Limit value: 300 watts

"VCCSA: More commonly known as System Agent Voltage. Intel’s maximum System Agent Voltage (Vccsa) is 0.971v and minimum is 0.879v. Stock is 0.925v. System Agent Voltage should NOT be touched, it is supposed to be a fixed voltage, and it powers many things that the VCC does not power. One of the most important is the Power Control Unit (PCU) which controls internal power allocation of the processor. This voltage is to be generated by a separate VRM than used for SVID. So on the P67A-UD7 this voltage is generated by a two phase buck analogue PWM, with 4 phases, this voltage and the VTT (Vccio) come from the same VRM(not surprisingly voltage read points are right next to each other as well). "

Quote taken from this guide: http://www.overclock.net/intel-general/910467-ultimate-sandy-bridge-oc-guide-p67a.html
Edited by Scorpion667 - 6/5/11 at 12:04pm
    
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post #12 of 23
Quote:
Originally Posted by bossie2000;13759544 
Use i7 instead!

And once again i find myself in the position of desperatly wanting a -rep button.
    
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post #13 of 23
^calm down he doesn't have any rep yet wink.gif
I think 8.5 hours of prime95 and 20 passes of linx is stable enough for daily uses?
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post #14 of 23
I BSOD'd very randomly with 1.325 VCC, but would pass 10+ hours of Blend. I had to bump it up to 1.375 VCC for stability (so far, knock on wood).

Mess around with the VCC (core voltage).
post #15 of 23
Bump up your Voltage 1 more notch.
    
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post #16 of 23
Quote:
Originally Posted by 996gt2;13759403 
I just tested my 2500K at 4.4 GHz, 1.308V, and it managed to pass 20 cycles (1 hour) of LinX AVX using all available RAM (about 6.7 GB) without a hitch, even though LinX AVX generates much higher temperatures than Prime95 blend.

However, when I ran Prime95 Blend test, my system BSOD'd with error 0x124 after 8.5 hours.

Since my CPU was able to pass 20 cycles of LinX AVX, would the problem most likely be with my RAM?

Current settings:

VCore=1.308
PLL Overvoltage=enabled
PLL Voltage: 1.840v
VCCIO: 1.10V
VCCSA: 0.955V
VDIMM: 1.500V (DDR3-1333 8-8-8-24)...Stock is 1333 @ 9-9-9-24

0x124....you can either increase the PLL voltage to 1.880v (this is not guaranteed to work, though), or increase vcore to 1.320v. That should get you the 12 hours stable that you want.

You might find that if you increase the vcore to 1.320v, you can put the PLL back at 1.8v default, but you may not want to waste all that time, so just raise the vcore.
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post #17 of 23
Quote:
Originally Posted by djpheer;13760626 
Who cares? When will you ever see those kind of loads for that period in real world use? Most I have ever ran prime for was 20 minutes. Never had a problem @ 4.63 on my 2600k under normal conditions. I say don't worry about it and stop taxing your poor cpu on useless prime runs and enjoy your computer. If it happens to BSOD during your normal use, then give it a bit more vcore.

I agree with this. I know there are some people who need prime because they do system critical stuff like folding, and if you are under 1.35v, then prime should be fine for them, but I regret ever priming at high volts on my system. My CPU *stopped* degrading when I stopped priming at over 1.4 vcore....surprise, surprise! Just been gaming instead, and its stabilized at 5 ghz, my temps are lower, and I'm a much happier person.
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post #18 of 23
Quote:
Originally Posted by djpheer;13760626 
Who cares? When will you ever see those kind of loads for that period in real world use? Most I have ever ran prime for was 20 minutes. Never had a problem @ 4.63 on my 2600k under normal conditions. I say don't worry about it and stop taxing your poor cpu on useless prime runs and enjoy your computer. If it happens to BSOD during your normal use, then give it a bit more vcore.

This. In many cases you can run prime for 24+ hrs completely stable only to crash on the desktop or in games, so imo anything over an hour or two is a complete waste of time

Raising your pll to 1.88v only delays the inevitable in my experience, and for 4.4ghz it's not needed
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post #19 of 23
Quote:
Originally Posted by Falkentyne;13767948 
I agree with this. I know there are some people who need prime because they do system critical stuff like folding, and if you are under 1.35v, then prime should be fine for them, but I regret ever priming at high volts on my system. My CPU *stopped* degrading when I stopped priming at over 1.4 vcore....surprise, surprise! Just been gaming instead, and its stabilized at 5 ghz, my temps are lower, and I'm a much happier person.

You're right, it's kinda stupid. I stress tested my 965BE so much that my motherboard mosfets degraded really badly LOL. Learnt my lesson tho!
    
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post #20 of 23
Thread Starter 
I increased the VCore a bit (to 1.344V) and now my CPU is seems to be fine after 8 hours of Prime95 at 4.5 GHz. I'll see how it does after one more hour or so.

One question. My motherboard seems to have some pretty epic VDroop. I have the VCore set to 1.340V + 0.060V offset (dynamic VCore with C1E and Speedstep on), and under 100% load my CPU VCore is only 1.344V according to multiple monitoring utilities (including the one that came with my motherboard, Gigabyte EasyTune 6). When the CPU is not under load the VCore goes back down to about 0.950V due to C1E. At no time have I ever seen it exceed 1.344V.

So, for all intensive purposes, since my VCore never hits the 1.400V I set in BIOS due to Vdroop, can I consider my actual VCore to be 1.34V?
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