FPS going down?

phanny30

Honorable
Apr 7, 2013
57
0
10,630
I upgraded my GPU from an EVGA GeForce GTX 650 2GB to an Asus Nvidia GeForce GTX 660 2GB OC.

When I played battlefield 3 on the 650 on ultra, it was fine. basically constant 30 FPS.

when I play it on my new 660, I get 60 FPS but it would usually go down sometimes to about 20 or so. Making it laggy, it still comes back to 60. But what is the problem? Never had this problem on the 650..