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If you are worried about temperatures in gaming I would suggest setting up MSI aferburner (or GPU-Z) so that it monitors the GPU temperature while running in the background. With MSI afterburner I think you need to go to "settings", "monitoring" tab and enable "log history to file".
Then load up a graphics-intensive game and play it for a couple of minutes and see what the GPU temperature reading said during this small test. I'm pretty sure you will find that the load temperatures are significantly lower than those in furmark/kombuster.

You shouldn't need to. Any cooler should deliver levels of cooling which are at a point where the GPU isn't throttled.

Ok guys - Just done a quick session and it stayed flat at 87c. To me that still seems much higher than it should be tbh... Only 3c away from a throttle. :S
Are you sure the overclock has been disabled?
I've had it in my machine for over a year, in crossfire so sitting next to another card pumping out heat, and I maxed out at 74ºC in games.
I'm aware that my case has got considerably better airflow, but what is the ambient temp in your case, and the cpu?