Depends on the speed of the CPU, it may a bit, but usually bottlenecks are over exaggerated and they are not as big of a deal as people say. It depends on the game, and it depends on your CPU speed. My CPU (a phenom IIx6) is technically a bottleneck but I only notice it in games like farcry 2 and crysis and it is not a big deal, it is the drop to about 50 FPS instead of getting above 60 all the time (i usually hit 90) it just hits sometimes. It should be fine, and you will notice a increase, just not a HUGE increase.