For me that would be too hot. Mine runs 50 c at load and I'd still like it to run cooler Get an aftermarket cooler, it seems your CPU is worth it if you didn't need to change voltages.
As such, the jump in temp is normal going from idle to 100% load seeing as you are OC-ing on stock cooler. However normal is not good in this case as 70 c is just too hot to run, that's why I recommended getting an aftermarket cooler, especially if you're going to stick with the OC.
I did, I installed a Zalman 9500, the idle is now 34 and load 68...
STILL too hot.
Get a better aftermarket cooler. I suggest the Tuniq Tower or Thermalright Ultra 120 Extreme.. thoses temps are still strangely high though... It may be a problem with badly applied thermal paste.
I agree with the last post, if you leave the voltage on auto on asus boards at least it will increase them with increasing FSB. sometimes far higher than required. I think about 1.3 - 1.4V is needed for that speed.
out of interest you say that the system is unstable if the voltage is any lower. Is the system prime stable at that voltage? I found that my C2D required an extra 0.05V to pass prime 95. Probs wont help your heat situation.
Yes, its stable at the default vcore of 1.35.
Anything below and it will reboot sooner or later.
Anything above only increased the temps, but still runs stable.
It might be the casing (too small maybe), no idea.
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