I'd also check your ram, if that was overheating it'd cause your computer to crash too. Heck, you can test it by just touching one of the sticks. BUT MAKE SURE you ground yourself first, i.e touch any exposed metal part of the pc chassis before touching the ram.
If it's running very hot, you may want to consider installing a fan for them, OR if you have them overclocked definitely put stock speeds back.
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