This has probably been covered at some point, but nonetheless...

Are these cards just a minor evolution from the 3XXX series (IE: G80 to G92) or could these cards be a large performance boost?

I'm just getting so tired of cards coming out today being... Hardly even a worthwhile upgrade from my old 8800 GTS 640 mb.

I remember when a new generation of GPU's meant suddenly all the games that were virtually unplayable on the last generation suddenly ran at 100 FPS with full AA/AF

Those days need to come back