I currently have 3 monitors running off 1 2GB GTX 670 GC. they are all 24" and 1920x1080. The left and right on are the same model and 60Hz but the middle is a 120Hz monitor. I am not sure on a few details.Which graphics card do i plug the monitors in when I have 2 in SLI? Will they all work fine with the 120Hz and 2 60Hz in SLI? Responses greatly appreciated.