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I've been using nVidia forever and I've never heard of such tweaks...
no it's not vibrancy it's clarity and sharpness, vibrancy is a total 100% no for people like me since I run a calibrated screen so cannot have colours being made more vibrant!
i thought that was a given
my old ati looked better than my 8800gt and my current 9800gtx in desktop
I now play GRID with "ultra" settings, reflections on 1024 because of the VRAM not playing fair with only 512MB ram but with Ultra @ 4xFSAA 1920x1200 I get 60FPS.
Fair !
I used to have to have a mix of high, 512 reflections and medium trees + some ultra on the 8800GT in order to peak 60fps !