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I7 940 Overclocking Brick Wall

B

Blitz1776

Member
So I recently got an I7 940 and decided to try my hand at overclocking and I've succeeded at getting a stable overclock at what I figure are some pretty insane voltage settings.

I7 940 Bclk 200x19=3.8 GHZ (max load temps around 75 celsius in prime 95 after an hour or so)

Cpu Voltage: 1.275 (could probably lower this one more)
QPI Voltage: 1.150

however anytime I've tried to go past this number to any significant amount ala 4ghz it crashes. I've been trying to isolate the issue, but can't seem to figure it out. I have isolated the ram by keeping it at or under it's rated 1600 mhz and leaving the voltages at its stock suggested.

Any help on the matter would be much appreciated (course in the end suppose I can always turn back on hyperthreading)
 
95C is super hot for a CPU. I wouldn't let it get up that high. Cooler temperatures might get you a little more margin.
 
I think you misunderstood I'm running prime95 and at max load which had it crash (bumped the voltages up to 1.2825 seems good now) it was 75 celsius tops.
 
I tried those when I first started overclocking even had the voltages at much higher settings 1.3-1.35 for the cpu and like 1.25-1.3 for the qpi but still had crashing instantly or when you tried to do something in windows.

Suppose my chip could just be a dud in the sense of going past, but on a positive note after I flipped my 2nd fan the correct way (had it going pull pull instead of push pull my temps dropped from 75-80 to 69-75, could probably kick back on hyper threading.
 
Blitz1776 said:
I think you misunderstood I'm running prime95 and at max load which had it crash (bumped the voltages up to 1.2825 seems good now) it was 75 celsius tops.
Click to expand...

My bad, I read "max load temps... 95 after an hour or so". Space will getcha every time 🙂.

You might just have a bad chip. Not that a ~1GHz overclock is "bad" per se...
 
Yeah your probably right, and no reason to have it completely hit the thermal ceiling, leaves a little headroom etc.

Just got back home and everything seems rock solid had it run blend for 10 hours, 2 hours of fft, and a couple passes of mem test, so everything checks out except for real world testing ^^
 
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