Hey there..I am having serious problems with fps...my specs are ..gtx 650 ti ..q6600 and 4gb ram...i played at low setting ...all low and at 1280*720p but i only get like 20-30 fps in csgo ....i have installed latest driver
because i believe it wasn't your hardware.
https://steamcommunity.com/app/730/discussions/0/144512753470558807/
Try this one. maybe because of 650Ti doesn't support dx 11, and you should change it to dx9 (?). maybe, Good Luck!