So i found a Gigabyte nVidia GeForce GTX 560 OC 1GB GDDR5, 256 bit, 2xFAN, 2xDVI, mini DP, rev. 1.0 :
Core clock 830MHz
Shader clock 1660 Mhz
So is the performence of that GPU equal/better than a GTX 560 ti?
Or i should just go to HD 6870 ?
HD 6870 is on par with the 560 non ti, GTX 560ti is quite a bit better than both of them. If you can't afford a 560ti go with a HD 6870 or 560 non ti whichever one is cheaper as they are pretty similar performance wise.