Is "ASUS GeForce GTX660 DCII-O, 2 GB DDR5" a supported graphics cards for GPU of Mercury Playback Engine acceleration in
Adobe Premiere Pro CS6?
No, but it works.
Use the nVidia Hack http://forums.adobe.com/thread/629557 - which is a simple entry in a "supported cards" file
[Moved to hardware forum.]
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