Normally, your BIOS will shut down a computer if your CPU reaches a critical point concerning heat. This is adjustable I believe. As far as vid cards, I think they will go until they fry. Each piece of hardware has it's own boiling point so it is hard to determine if there is an average temp a CPU or vid card can handle before performance is lost. You will need to look specifically for your hardware. Such as my Phenoms will reach critical mass somewhere around 65-70 degree C. My CPU run at around 42-45 degrees C under intense use so I have plenty of cooling going on.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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