I didn't upgrade the PSU because I assumed (and the PSU-calculator of the manufacturer said the same
) it would be sufficient: it delivers up to 20A on the CPU's 12V-rail and up to 25A on both of the rails for the GC. Max. output power is 550W, it's this one:
http://www.be-quiet.net/be-quiet.net...websiteLang=en
Currently I don't have any other game which is up to date...
I've plugged in my old GTX260 and it ran fine without any crashes. As I've seen the GTX260 consumes about 30-40W less than the GTX560 - maybe that's the reason?