Overclock passes all tests but freezes

[EWeber19]

I recently overclocked my computer but however it seems to randomly freeze up. I'll have it running for the hours during work or at night but when I go to use it, the screen won't come up. I check the downloading history or so and see it freezes up a couple of hours prior. This is about the third time now without any error message and by randomly, I mean a couple days of running or about a week of running just fine. All driver are updated, BIOS has been updated. This setup is about 2 months old and went through the tweaking process already. This is the highest OC I achieved. Here is what I got:

I7980- OC'd to 4.425
24GB DDR 3 2000MHz at 1770MHz
CPU vCore- 1.4v
Mem- 1.7v
everything else is set at auto (Timings, other voltages), tried manually but runs stable on auto.

It will run LinX at 100 passes, Prime95 for 16 hours fine but just randomly freezes, sometimes just idling, sometimes while doing random tasks. It'll run fine for days then freeze. Then run fine for 2 weeks. Passes memtest with 3 passes. I was having problems with BSOD for the memory but manually adjusted it to 1.7v from 1.68v and haven't seem a BSOD since. Do you think it needs to be bumped higher? Should I loosen the timings more from the auto setting? The timings at auto are 10-12-10-10 for the memory that is rated at 9-10-9-9. Thanks for the help

[SoloCamo]

From the sounds of it you are on the right path, loosen the timings and if the results are the same try to even underclock it slightly. If the results are the same, try one more slight bump to the volts but with the lower settings and see if it clears up.

Going from an unstable 1.68 to a "stable" 1.7 is not really a discernable difference and could cause a BSOD/lockup with a slight fluctuation in volts.

If that still persists, try to test one stick out at a time as 24gb of ram is a lot, and there is a high chance that one stick (or more!) simply isn't as stable as the others.

On that note however, what PSU are you using for this system?

Also, as far as the CPU goes, the 4ghz barrier seems to be broken easily enough these days, however I've seen people with a lot of problems from 4.2ghz up.

Have you tried to drop the CPU down to 4.3, or perhaps even 4.4 flat vs 4.425?

And one more thing, is the GPU overclocked at all? Oddly enough I had this problem with my x1950pro a long time back and I hunted it for weeks until realizing the GPU was just slightly unstable.

[quickoldcar]

At 1.4 volts for the cpu is gonna throw out some heat, what heatsink/fan are you using.