The Athlon II X4 should be too much of a bottleneck for the HD 7770. There is always some sort of bottleneck present in every PC. An HD 7770 is a low-mid range GPU that performs very much like the GTX 460 and HD 6850:
Ecs A75f-M2 motherboard, i probraby wont even get battlefield 3, i just want to benchmark my cpu and gpu against it so i know how if theyre good enough for other games.