Constant Down Clocks to 2D Clocks?

Technical Support
In game, at random times my graphics card would reset and downclock everything to 2D clocks. This happened with other games, where 3D clocks wouldn't run at all, and I would have to reset my computer for it to work properly again. But, in SC2, it would run fine, but then randomly downclock itself. I've already re-installed my drivers, running an Nvidia GTS 250 with the 258.96 WHQL drivers. The only way to remedy the situation is to run a youtube video in the background or some other 3D application, but this puts some strain if I decide to play online. Any help would be appreciated.
Nvidia Control panel > Manage 3D Settings > Global Settings> Power managment mode = Prefer maximum performance > apply > reboot

should do the trick and keep you at full throttle

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