As said, try ATI tool as well and look for artifacts. Have you got farcry 2? or crysis warhead they are both pretty intensive as well. You need to monitor all the bits of the card when using furmark etc with something like the GPUZ tool -that way you can see the memio temps and not just the core. 75 on the core sounds good but if the mem or voltage regulators arnt seated well on the sink then they could be much hotter.
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