Okay, so you have no idea how to compare performance? Let me show you how easy it is!
The GTX 960 is 60% faster than your GTX 560. Let me tell you how easy it was to figure this out:
1. TechPowerUp review shows GTX 680 7% faster than the GTX 960.
2. Older TechPowerUp review shows GTX 680 70% faster than the GTX 560 Ti.
GTX 960 is 100/107 the speed of the GTX 680 = 0.93
The GTX 680 is 100/59 the speed of the GTX 560 Ti = 1.7
1.7 * 0.93 is almost 60 percent improvement. And that's from a $190 card:
And if you must have more performance, this is over twice as fast as your GTX 560 Ti, and is only $300.
Now, quit your complaining. Both Nvidia and AMD are up against a wall because there's only been one process node shrink since 2011. 14nm is due next year, but until then they had to make magic happen with Maxwell (it's a more efficient architecture, making better use of available compute and memory resources to reduce costs).
That said, the GTX 680 is on the exact same process node as the GTX 960, and it cost $500 on release! So if they can offer nearly the same performance for $200 today, imagine what they can do in a year or two when they actually have a process shrink to work with!