Overheating problem

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What CPU do you have? A basic c2d or a quad? You may have said but I didn't see.

My guess is you are at the high end of acceptable range. You may have a bad case design or otherwise crowded case or perhaps your heatsink is not fitting perfectly. I'd reapply thermal paste and re-seat the heatsink if you have not already. Those Intel pins are hard to get into locked position. Be sure they are snapped in dead tight and all the way down and that your thermal paste/pad looks just right, not too much or too little. Make sure the CPU fan is spinning too. You need to twist those pins into 'lock' position, they have a 'release' and a 'lock'. The lock position is COUNTER to the arrow on top of the pins. A lot of ppl get this part wrong and then the HS pops up a little making only partial contact.

If after all that your are still idling at 60c on the cores in a coolish room then I'm at a loss to explain it. Unless your case is really poor. The way temps are jumping around from moving the HD might be indicative of that. The stock Intel sink should be fine for any non-overclocked system, even a mildly overclocked system.

Your system will probably be OK at that temp but you might want to play it safe and get a better cooler. I'm not sure there is any hard and fast rule about operating temps and life of the CPU. Technically you are under Intel's safe temp guidelines, IIRC. CPUs are very hardy animals.

The bottom line is probably system stability. A system crash here or there is par for the course but if it is happening with any regularity under heavy load this would indicate a temp problem.
 
I have a c2d... I'll reapply the thermal paste and re-seat the heatsink as soon as I buy the thermal paste. I'm also thinking of adding an extra case fan to the front. We'll see if that changes anything...