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.
Windows XP: http://www.nvidia.com/object/winxp_196.21_whql.html (http://www.nvidia.com/object/winxp_196.21_whql.html)
Windows XP 64-bit: http://www.nvidia.com/object/winxp64_196.21_whql.html (http://www.nvidia.com/object/winxp64_196.21_whql.html)
Windows Vista/7 32-bit: http://www.nvidia.com/object/win7_winvista_32bit_196.21_whql.html (http://www.nvidia.com/object/win7_winvista_32bit_196.21_whql.html)
Windows Vista/7 64-bit: http://www.nvidia.com/object/win7_winvista_64bit_196.21_whql.html (http://www.nvidia.com/object/win7_winvista_64bit_196.21_whql.html)
More information can be found on threads such as these:
http://forums.nvidia.com/index.php?showtopic=161525 (http://forums.nvidia.com/index.php?showtopic=161525)
http://forums.nvidia.com/index.php?showtopic=161503 (http://forums.nvidia.com/index.php?showtopic=161503)
For FPS Problems:
Quit the game first, then look under your My Documents/Starcraft II Beta folder, you should find a Variables.txt file there. You can open this file with your favorite text editor such as Notepad, and add the following line:
frameratecapglue=30 (Menu's)
frameratecap=60 (Everything else)
This will cap your framerate to 60 in the game, which should give your videocard some breathing room. You can put any number, see if a lower number like 30 helps as well, though you will lose framerate.
This is only a temporary workaround, an upcoming patch will have an automatic solution for everyone.
Hope this helps!
also please note sometimes when patching or installing Files can also get corrupted, Try to reinstall if the previous does not work.
Bummer... sorry Nvidia users!