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Stable O.C. Yesterday, Unstable Today?

post #1 of 26
Thread Starter 
So, I just bought a new HSF, and was trying to further my O.C. On Friday, I found this to be stable for 1:30 hours of Prime95:
240MHz reference
1600MHz RAM
1920MHz HT Link
1.55V Vcore
1.253125V CPU/NB
1.65V RAM

Voltage was too high for my liking, so I continued my O.C. on Saturday, trying to get lower Voltages. I found this to be stable at 1 hour of Prime95:
240MHz reference
1600MHz RAM
1920MHz HT Link
1.54375V Vcore
1.2625V CPU/NB (Yes, the CPU/NB required more volts to be stable for unknown reasons)
1.6375V RAM

Sunday, I was going to wrap up my O.C. and did a final test. My PC crashed within 30 minutes of Prime95. I decided to step up the voltages, and it still crashed. Now, the first setting I had it on Friday won't pass 30 minutes of Prime95.

My question is "How can a Overclock be stable one day, but unstable the next?" It's just frustrating because without consistency, it makes it very time consuming to overclock. madsmiley.png
Edited by charlie310 - 3/28/11 at 12:20am
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post #2 of 26
Quote:
Originally Posted by charlie310;12898669 
So, I just bought a new HSF, and was trying to further my O.C. On Saturday, I found this to be stable for 1:30 hours of Prime95:
240MHz reference
1600MHz RAM
1920MHz HT Link
1.55V Vcore
1.253125V CPU/NB
1.65V RAM

Voltage was too high for my liking, so I continued my O.C. on Sunday. I stepped the Voltage down one step for Vcore, CPU/NB, and RAM (of course, doing it individually), and couldn't get it stable. I then decided to test it at the previous stable settings listed above, and it crashed within 30 minutes of Prime95.

My question is "How can a Overclock be stable one day, but unstable the next?" It's just frustrating because without consistency, it makes it very time consuming to overclock. madsmiley.png

What are your load temps?
If it's dangerously high, then it might be unstable because it's degrading.

*edit*

1:30 hours isn't enough to degrade it by that much though.. hmm
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post #3 of 26
Quote:
Originally Posted by charlie310;12898669 
So, I just bought a new HSF, and was trying to further my O.C. On Saturday, I found this to be stable for 1:30 hours of Prime95:
240MHz reference
1600MHz RAM
1920MHz HT Link
1.55V Vcore
1.253125V CPU/NB
1.65V RAM

Voltage was too high for my liking, so I continued my O.C. on Sunday. I stepped the Voltage down one step for Vcore, CPU/NB, and RAM (of course, doing it individually), and couldn't get it stable. I then decided to test it at the previous stable settings listed above, and it crashed within 30 minutes of Prime95.

My question is "How can a Overclock be stable one day, but unstable the next?" It's just frustrating because without consistency, it makes it very time consuming to overclock. madsmiley.png

1h30 P95 isn't enough to call it stable.
Go for, at the least, 8h small FFT then 8h Blend.
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post #4 of 26
Thread Starter 
Quote:
Originally Posted by dcyli;12898679 
What are your load temps?
If it's dangerously high, then it might be unstable because it's degrading.

*edit*

1:30 hours isn't enough to degrade it by that much though.. hmm

Load temps are fine (49 degrees). FYI, I changed OP. Been O.C.ing so much, it's hard to remember what I did on what days.
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post #5 of 26
Quote:
Originally Posted by Kerian;12898706 
1h30 P95 isn't enough to call it stable.
Go for, at the least, 8h small FFT then 8h Blend.

+1
I AGREE 1 1/2 HRS IS NOWHERE NEAR ENOUGH TIME TO BE SURE YOUR STABLE. i have had overclocks run good for a few days under normal load then crash ( bsod) as soon as i started prime. I ran my current OC for over 24 hrs+ prime 95 and its still going strong!
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post #6 of 26
I gotta agree with the other fellows.

Usually you want somewhere between 8 to 24 hours of priming to determine if you have a stable overclock.

But because you only did it for 1.5 hours it would make sense that it failed the 2nd time you ran it when you went back to the configuration; assuming the first time you ran it wasn't enough to fail it.
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post #7 of 26
For the record, mine passed 24h small FFT and two times 24h blend (second time was because I add another GPU).
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post #8 of 26
Thread Starter 
I know 1:30 is not "stable". I meant "stable for 1:30". So, you guys are saying the same settings can run Prime95 stable for like 5 hours one day, but crash instantly on another?

How do you guys find the best overclock? 8-24hrs of Prime95 implies OCing takes a really long time for you guys. My previous OC was tested 5hrs Prime95, and I never had any problems.
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post #9 of 26
Quote:
Originally Posted by charlie310;12898836 
I know 1:30 is not "stable". I meant "stable for 1:30". So, you guys are saying the same settings can run Prime95 stable for like 5 hours one day, but crash instantly on another?

How do you guys find the best overclock? 8-24hrs of Prime95 implies OCing takes a really long time for you guys. My previous OC was tested 5hrs Prime95, and I never had any problems.


IMO , to be sure you have a stable reliable system its worth investing the time in your overclock!
The idea is that 24+hrs of prime will stress your cpu beyond anything else , to ensure its stability!
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post #10 of 26
Quote:
Originally Posted by charlie310;12898836 
I know 1:30 is not "stable". I meant "stable for 1:30". So, you guys are saying the same settings can run Prime95 stable for like 5 hours one day, but crash instantly on another?

How do you guys find the best overclock? 8-24hrs of Prime95 implies OCing takes a really long time for you guys. My previous OC was tested 5hrs Prime95, and I never had any problems.

There are certain programs that stress your system better/faster to determine if it's stable.

I have heard that occt, intel burn test/linpack/linx, are fast at telling you if your cpu configuration is stable/somewhat stable.

So...

What I would do is use these programs to do a rough check on my stability, if it doesn't pass it most certainly won't pass prime, if it does pass then I use prime for 8 hours or so to test the system more thoroughly.
Edited by dcyli - 3/28/11 at 12:46am
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