welcome to the forums newcomer!
we need to know the entire specs of your system, all the way down to the PSU. Can't have you pointing a finger at by saying that we suggested a power GPU that was too much for your flimsy PSU. Thus the pissing away of a perfectly working system
actually the GTX 560Ti is higher than the 560 by only one tier;http://www.tomshardware.com/reviews/best-graphics-card,2964-7.html
like i said, we need to know the entire system specs, we can hopefully work from there