That PC should be pretty strong in Battlefield 3 at 1920x1080. My guess is mostly Ultra with some high and a low level of AA in order to keep good FPS in multiplayer. Definitely close to 60 on high settings with maybe some drops during big battles due to the CPU.
Far Cry 3 is a little different. As you can see from the benchmark below, the Phenom gives you an average of around 53 FPS.http://www.tomshardware.com/reviews/gaming-processor-frame-rate-performance,3427-5.html
Graphically, it's a lot more intensive. My guess is the 570 will only be good for maybe medium settings with FPS in the 40's.