You will easily max out CS: GO.
Though, Kamen is right about GTA 4: that thing depends on your CPU too much and is very unoptimized. The fact that FX 4100 is a weak CPU doesn't help. Overclocking might help, but you will not be able to play at higher than medium-high settings if you want 60 fps.
P. S. People film gameplay on youtube and upload it as 'playable', even though they are getting 25 fps. That's not what you want, really.