look at my specs (in sig), i think they are below the minimum system requirements, however I'm running it on solid 30-40fps, take that as you will. also if you are asking about multiplayer, I'm not sure, as I don't play it (my ping too high). However 2.5 runs very well for me in SP
at the end of the day it's up to you if you find this fps acceptable, if you do not and are used to having 60+ then I wouldn't upgrade.
here are my settings