CPU overheat possibilities

MEL1315

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Mar 30, 2015
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I just bought a used core 2 quad q9400 processor. The cpu temp at idle is now above 45°C. Is it possible that the cpu is defective? Or is it because of the stock cooler or thermal paste applied wrong?
 
It's more important which temperature is at usual or full load. Idle temps should be about 10 -15% higher than ambient temperature. Other than CPU cooler itself, ventilation in the case can also influence CPU temperature. Defective CPU is a very small chance. You should also check voltages GPU works under and CPU cooler fan RPMs.
"Idle" CPU state can also be a variable but that depends what OS is doing at that time you consider as idle. OS could be doing a lot of things in the background even when you don't do anything intentionally.
 

LogicBomb31

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Dec 26, 2016
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Not all generations of CPU run as cool or hot. The new CPU i series and particularly the new ones run much much cooler innately. My old Q9550 ran pretty close to 40C on the stock cooler/stock BIOS settings but that was many years ago and I don't remember the specifics like room temp or case setup.
 
Ah. I wasn't sure which stock cooler C2D or Q). Last time when I did something like that I had to change cooler to stock one for the quad, it was taller and had copper insert. Cooled much better too. There are man inexpensive aftermarket coolers.
This one http://www.lc-power.com/en/product/archive/cpu-cooler/cosmo-cool-lc-cc-92/ worked even better.
 

MEL1315

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Mar 30, 2015
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thanks for you reply mike. I've checked the site but it doesnt seem like a shopping site. I've started another thread here because this one is already solved and it could help others as well.
Please check the title if you could spare some time- cooler for core 2 quad q9400.
thank you...