I don't like military shooters, i don't play bf3 for that matter.
I can't say what performance it will get cause i don't have the cpu in question, but it's a dual core sandybridge, has two fast cores, good enough for a 7850, i can say that in some games like ps2 it will decrease the performance, but you can't put in there an i5-3570k with a budget of 500$ for the pc, what it matter is the gpu for games, and for 1080p gaming the minimum recommend is a 7850.