My frame rate drops from 60 to about 20 after a little bit of time playing games I have a gtx 660 SC with 3027 mb of vram
It stays like this for all games until I reboot my pc
I get around 50-60 degrees Celsius while playing most games like skyrim
Check the temperatures of both the CPU and the graphics card. And install the very latest graphics driver for good measure. If all temperatures seem good (60C would certainly be more than fine for both CPU and graphics), then try dialing back any overclocking if any such settings have been tweaked.
What kind of power supply are using?
Coolermaster 700W psu
well I fixed it by putting back some Over clocking its fine now thanks for the help