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I've read stories of some Matrix 7970s have weird heatsink issues, maybe still have the plastic still on the vrm.

I'm able to OC mine to 1250mhz 1.24v, and at 65% fan i never hit 70C on load. Should i try and open it up and see whats going on with the memory? Currently have to downclock from 1650mhz to 1600mhz or else i get some weird artifacting (small 2x2" square checkerboard effect)

I have some Thermalright Chill Factor 3 lying around I was thinking of using.