Originally Posted by xorbe
I have this issue too on my EVGA GTX260-216 (55nm) "675MHz SSC" edition. The card is running with default settings. Only my CPU is overclocked. (The video card is already more than I need for my LCD.)
After any 3D, it seems stuck at 675/1458/1152 forever at the desktop.
One workaround is to change your desktop resolution and back (just cancel when it asks you to confirm). After several seconds, it should downclock back to power-saving mode.