The 560 is your weak link, throw the 680 in and you should be alright,
I play with a 975 and two 6950's so I know your chip shouldn't be an issue
I did as you told me to. I put in the GTX 680, but I'm still suffering from FPS drops. I thought Crysis 3 was supposed to be GPU intensive; why is it using all my CPU? I tried running it on low, medium, high, very high, and no AA.