Team fortress 2:
RED vs BLU, everyone knows whats this game about.
Ace Online:
MMOTPS space bees game, you choose between 2 nation that fight for the control of a planet called Phillon or some shit like that, massive pvp wars never get old.
1280x800, everthing on high, vsync and physx off.
It is very playable but my 9600gt and E5200 are getting older every day :U
Thinking about switching to an am3 board for December or next year maybe.