quad q8200 internet browsing at 100 degrees

WinDOS

WinDOS

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Hi, My mums computer is using an intel core 2 quad q8200 processor (x64) and we have been having thermal timeout errors where the machine turns off through overheating. I have run CoreTemp and it was saying how one of the processors was running at 100 degrees C just internet browsing.
Core One Min 74 Degrees Max 107 Degrees
Core Two Min 70 Degrees Max 98 Degrees
Core Three Min 70 Degrees Max 97 Degrees
Core Four Min 70 Degrees Max 93 degrees.

The pc is running vista home premium, what should I do, I recently changed the box to a smaller box and recieved this problem with the CPU fan running at 4000 RPM instead of normal 2000RPM, when i put everything back in the case, it ran at 2000RPM (after I plugged in a rear fan to the mobo.) The CPU fan Revs every couple of seconds too, should I be worried, I checked the thermal paste and there is still enough on the processor. Now the processors are running at 67 Degrees but will occasionally spike to over 100 like I mentioned. The PC is an Advent QC7003. Thanks for any ideas. If it is thermal paste, can someone give me a walkthrough. Thankyou.

EDIT: Which ones of these would you suggest if so?
 
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You checked the thermal paste and there seems to be enough on. That tells me 2 things. One, you checked the paste and then just put the cooler back on. Two, there might be too much on. Clean it off with isophoyl alcohol, both off the cooler and CPU. Use a coffee filter to do so. Next buy some thermal paste. Arctic silver 5 is good. Spread an even film on the cpu with a credit card, then reattach the fan. Then I'd suggest dusting everything out.
 
If the fan is spinning faster than normal that's normally an indication that there is dust in the CPU heatsink. Take the PC outside, spray it with compressed air (you can normally pick up a can for several quid on Amazon) and then see if it's any better.

Could be the thermal paste. I'd just remove everything that is on there right now with alcohol and reapply new paste.
 
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