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Is there any way I can heat up my CPU and see if the heatsink works?

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Use a benchmark program such as 3DMark or a “burn-in” utility such as Prime95.

If you want to have your CPU do something more productive while under a heavy load, use a distributed program like BOINC or Folding@home to have the CPU cycles put towards calculating things for finding cures to diseases, searching for extra-terrestrials, etc.

To keep an eye on the temps, use a monitoring program like SpeedFan.

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+1 For being the FGIW, but you improved your answer providing some alternatives. If you are a mathematician, it is productive towards discovering the distribution of the prime numbers... – Tom Wijsman Sep 8 '11 at 21:29
Prime95 for the win~! – Justin Pearce Sep 8 '11 at 21:38
>>>>>>>>>> FGIW? – Linker3000 Sep 8 '11 at 21:40
@Linker3000 Fastest Gun in the West (even if it's just by 3 seconds) – sblair Sep 9 '11 at 0:36

If you can read this answer, it probably works.

If you want to see how good it works, use software like Core Temp (°C) and Prime95 (stability test).

It's important that you monitor the temperature, you don't want to damage your equipment...

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