that's the thing though I keep everything pretty clean...about 3 cans of air per month's worth. I haven't pulled the card in a long time so possibly there's some gunk hiding where the air-blasts can't reach it.
I'll pull the card and give it a real good clean, see if that makes a difference.
thanks for your reply F -
It may also be time to replace the TIM between the chip and heatsink. If you're going to give it a thorough cleaning, take the time to reapply new thermal paste of your choice.
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