If I upgrade from onboard to an Audigy 2 ZS, will I see noticable differences in fps? Or is the Audigy only a good buy if you actually use a 5.1 setup? Currently I'm resorting to headphones. If I'm not going to gain a lot of frames but I still want to set up a speaker system, should I opt for another card like the CHaintech 710 7.1?