I have a fx 6300 + 8gb ram @ 1600mhz + GTX550TI
All settings on low @ 1920x1080p I get average of 58FPS in a 64 player map on conquest LARGE. Same as with CANALS with 64 players team-deathmatch I get an average of 62 fps.
I was hastling to get a new GPU or CPU/ram/mobo. I got the new cpu/ram/mobo and it gave me amazing FPS boost, former FPS was average 25/40, now its 58 to 88 FPS (low settings ofcourse)
If you want to play games at higher settings and a better FPS, I advice you also to get a newer GPU.
Hope this helps you out