Haswell overclock works, then doesn't

teppic

teppic

teppic

Soldato
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25 Jun 2013
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I've been running my Haswell set up at 4.3GHz / 1.23v without any problems, though I've not done serious stress testing (it's been fine in games, etc.).

I decided to run Seti@Home for a bit. It was fine running for a few hours, results were validated and there were no problems. Then when I later booted the computer was locking up or crashing. I've tried reducing the OC to 4.2GHz and increasing the voltage to 1.25v and it still locks up within seconds of Seti@Home starting.

I've got it now back on stock settings, and it's running fine.

I can't understand what's happened. Can a CPU start to fail an overclock this quickly?
 
Yes, I believe so. I tried killing my i5 760 chip with some bizarre settings. And I could log into windows, but I could crash it with msi control centre opening up
 
try adjusting voltage and imc voltage to suit that program,see if it still crashes? its stressing something or its a software issue somewhere

if its running from your ssd try running chkdisk on it for any errors
 
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seti@home is a bit like prime95 - I had it running for about 6 hours at 4.3GHz/1.23v. The PC is now crashing within 3-4 seconds at 4.2GHz/1.25v.
 
I've just reinstalled it to check that. I'll try putting up the clock speed back to 4.2GHz/1.25v. I'd have expected the app to crash though rather than the PC if it weren't an OC issue.

edit: Trying 1.235v and 4GHz for now, it's stable but my temps are really high. Could it be the TIM?
 
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It was getting to 90C. Dropping it to 1.2v and running at 4GHz is working at the moment, temps around 76-80C.
 
could be down to ambient temps,its hot today

what paste did you use? if liquid pro/ultra it doesn't like it if the cooler has been disturbed after

might help with a clean out of the cpu fan/heatsink it could have dust built up and a re paste then see what happens
 
It's MX-4. I intend to replace the cooler with my decent one soon, at the moment it's a cheaper one - but like I say, it was running fine before. It's all new stuff and completely dust free.
 
mx4 should be ok

tried a long cmos clear and re enter your bios/oc settings? might help

cant think whatelse it can be

or switch to backup bios and see if temps are higher/lower
 
Something's screwed. It was working, then powered off. Switch on - it gets to the UEFI splash screen and shuts down. Tried clearing the CMOS, it gets to the same place, says it has reset to defaults, then powers off. Start up again, no change.
 
It gets to where it should start to boot then powers off completely. The CMOS has been cleared though - it says that before it powers off.
 
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