cats_Paw :
Too many relaunched and renamed stuff. My 560 Ti still manages everything. Ill wait till the upgrade is actually worth it.
Depends on the games one is playing, resolution, desired degree of detail, etc.
I had two 560 1GB Tis (900MHz) and although performance was very good
(easily matching a 670), the VRAM was occasionally limiting, and combined
they couldn't quite let me max everything out in Crysis2. Hence, I switched to
two 580s which really does kick up the performance by a good margin (faster
than a 780).
I suppose it boils down to what one regards as an acceptable performance
improvement when doing an upgrade, and that's affected by numerous
factors, eg. no point changing the GPU if one's CPU is a bottleneck. Without
a doubt though, assuming no bottlenecks elsewhere, a modern GPU such
as a 780 will be at least double the speed of a 560Ti, unless you're playing
old games which rely on older DX9 features, or a game that's incredibly CPU
bound such as X3TC.
Ian.