This is interesting. I can confirm it's at least not a heat problem. All I can do is tell you my situation at that time.
Ati HD5970. Core clock/mem not ramping up for CoD.
There was a thread about using ATI tools to lock the clock/mem. As the standard CCC didn't offer this option for me. I did this, but found it utterly unstable, lock-up, freeze.. had to reboot.
I did get into the game at some point, and soon as I got in the cock-pit I had the small white dot artefacts as described.
I don't know why. The card was forced at stock speeds.
Anyway, a friend told me to check that Flash Player doesn't have "enable hardware accelaration", this in itself for some reason with CoD forced a lower clock speed.
I unchecked this, and disabled the ATI tool option of force clock, and now my clock/mem is as it should be in a 3D app, and no artefacts.
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