This is an important issue indeed, so I will repost here what have been posted on the battle.net forums:
We're getting reports where users are getting intermittent low FPS after installing these drivers. It seems that it is related to the fan control included in these drivers not working correctly and is causing the video card to overheat on 3D applications. This will affect Warcraft 3, World of Warcraft and StarCraft 2 Beta. Please uninstall the drivers and revert back to the older ones.
Okay, here's the fix for those who like how the drivers run. Even reinstalling them didn't correct the fan control. It was still not ramping up as it should. The way to fix it is to run regedit and delete all instances of RmThermalProviderInfo and RmThermalProviderNum entries in the registry. Then reboot. Check your fan control and it should be exactly the same as for previous drivers.
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