My i7 920 has been running around 4Ghz for over a year now at full force, 100% load while folding. In the Winter it averages 75-83c and right now(summer) it pushes constant 83-90. Doesn't seem to bother it in the least. I think people just tend to err on the side of caution, heat isn't going to kill them. I did a test and let my CPU hit 100 over and over, just to watch it throttle. Very long term use of doing that could have shortened its life I suppose, but it is volts that are going to do the real degradation/damage. I am 100% confident that mine is going to be fine now and for a long time, even at 90-92 during the hottest days. As long as I keep it at this low voltage, I am barely over stock, maybe two steps up in very small increments.
Same on my AMD rig(sig). It has been running 24/7 folding for around two years, pushing the max of 65 for those chips. This was before I got my mugen, mind you. Now it is low 40's tops. But for the first year and half at least, it was 24/7 60-68c and it kept on chugging with no folding errors or bsod's, etc.
CPU: Over 70,
GPU: Over 80, but it never goes over 75.
When it comes to my netbook,
CPU, GPU: Over 90. Both of them pretty much peak @ 85-90c when gaming, but it turns out that HAF 932's top fan is a great notebook cooler!
For the CPU I like to keep the max temps on all stress tests under 90C. Never gets that hot in normal use though. These chips are built to take some heat and I don't really care if my chip fails in 6 years instead of 12.
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