Overclock.net › Forums › Intel › Intel - General › Strange OC issue...
New Posts  All Forums:Forum Nav:

Strange OC issue...

post #1 of 8
Thread Starter 
When I have my CPU overclocked (sig rig), L4D and L4D2 crash to the desktop after an arbitrary amount of time (10-20 minutes). The strange part is that I passed 5 hours of LinX and 8 hours of Prime95 using 90% of ram. I've run memtest for 3 passes and it's fine. GPU is not overclocked and can run any benchmark without an issue, runs Furmark for 30 mins under 75C. Any ideas? I don't want to rail up the vcore any more than absolutely necessary.

*edit*
It doesn't seem to matter what I overclock to, I tried 4.5 and 4.2 with the same result. Running everything at "Auto" the games run totally fine.
post #2 of 8
Thread Starter 
Any ideas? Will adjusting LLC help? Should I try using fixed vcore rather than offset?
post #3 of 8
Well, if it is stable in everything but those two games then I'd suspect something with those games instead. Maybe try verifying the files through Steam? I've had problems with games crashing and a re-verify found corrupt files that, once re-downloaded, fixed the problem. You could also try different video drivers. But I wouldn't mess with the overclock if those are the only games you have problems with.

Edit: Didn't see your edit about it working fine on Auto. Have you tried running Prime95 with only a single worker thread? L4D isn't very CPU demanding, so if the CPU is slightly unstable in a high-freq but low-load situation (which can happen if you are using offset), that could be causing the crash. Have you tried disabling C3 and C6?
Edited by Forceman - 10/24/12 at 11:31am
post #4 of 8
Thread Starter 
I haven't tried disabling any power saving settings yet, but I may do that just to test stability. I have yet to try P95 with one worker, but I'll try that when I get home from work. I will also try running with a fixed voltage and see if that makes a difference. Even though you edited, I'll address your other points as well. The GPU drivers are fine, the GPU driver isn't crashing or hanging in any way. I verified both games in Steam and they were fine.

I'm inclined to believe that the vcore is insufficient to maintain stability at less than full load. My question is this: How do I fix it without disabling power saving options? This PC runs 24/7, as it runs a server in the background and I can't be using that much power or dumping that much heat into my office.
post #5 of 8
Quote:
Originally Posted by hermitmaster View Post

I'm inclined to believe that the vcore is insufficient to maintain stability at less than full load. My question is this: How do I fix it without disabling power saving options? This PC runs 24/7, as it runs a server in the background and I can't be using that much power or dumping that much heat into my office.

If you are using offset, you can try lowering your setting for LLC and increasing the setting for offset (so that the resultant load voltage is the same). That helps (sometimes) by slightly increasing the voltage in lightly loaded situations when LLC isn't fully countering the Vdroop. It doesn't always work, but it can help in some situations. Also you can try just disabling C3 and C6, while leaving EIST and C1E enabled - on some boards C3 and C6 can cause idle instability with offset voltages. Not exactly your situation, but maybe worth a shot.

Might be easiest to test it first with a fixed voltage though - that' should help tell whether it's a voltage/offset issue or something else.
Edited by Forceman - 10/24/12 at 12:31pm
post #6 of 8
Thread Starter 
Well, with a fixed voltage of 1.235 it's stable. On load it's 1.236v, on idle it's 1.260v. So it is a voltage issue. How can I fix this and still use offset rather than fixed voltage? I'll try lowering LLC a bit and bump the offset up first. Any other input?
post #7 of 8
Simplest way might just be a straight voltage bump - just push it up a notch and see if that works. Otherwise I'd try the LLC change and disabling C3/C6 if they aren't already.

Did you try running Prime or IBT with a single thread and see whether it fails? Won't tell you much you don't already know, but if it fails with the original settings at least it would let you use it to stability test it as you move forward (quicker than playing L4D2 for 20 minutes waiting for it to crash).
post #8 of 8
Thread Starter 
Just in case anyone else has a similar problem and finds this thread, I dropped the LLC to medium and increased the voltage until it was the same under load (1.236v) and it solved all the problems.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel - General
Overclock.net › Forums › Intel › Intel - General › Strange OC issue...