Sure it will do, but a cpu do not generat that much more frames and if the load is still okay in a game like cod, I would personally wait a bit longer. Sure, the newer cpus are better, but there is no real big hit for most games since my i7 and this is even older and eats electricity as hell. SOMETIMES more important for game like arma 2 or clod is the speed of your hdd. A normal hdd could decrease your performance as well. I switched from a normal 7200rpm hdd to a raptor and noticed performance increases in stability and less stutters. And after switching again to a ssd (sata 600 speed, but I get only sata 300 speed), it was again a big step forward for games with streaming engines. although it is now only running sata 300, it still reaches a high performance. In all day life, the ssd would only run a little bit faster with sata 600. There is more speed written down on the specs, but have a look over test results in normal usage, not generic testings to find out max speed under optimum conditions. This simply never happen.
The samsung 830 at its release had a very good controller and performs good in every circumstances. But I do not know, if it is still top edge for affordable ssd. This ssd should be now very cheap. I paid nearly double the price of nowadays, and that is just 5 months ago. Sad for me, but I will perhaps buy another one.
CPU can increase performance, but for a big fps hit, do not expect too much by changing. But performance is not only fps!