Nope, its not optimized for nVidia, but nVidia optimized the drivers for the game, with every driver update FPS in Crysis increases, it gave ~20FPs at start in ice level but with 191 drivers its giving 28+.
DX9, with a memory patcher to use extreme effects. Not much, maybe a few FPS difference in ice levels but not sure, but its definitely better than 178 drivers(I used it to play Fallout 3).
Mention the brand of the PSU. No need to mention the details of the processor. Everyone knows that or can find out from the model number.
It was simply the driver optimization, nvidia put a lot of efforts in optimizing them for Crysis, when Crysis came out ATI had no card to compete with 8800GTX/GT/GTS or the likes, later performance was better for the ATI cards, and I do admit that Crysis scales much better in SLI than CrossfireX but that could be the very issue I was pointing out.
Yes, crysis do scale well with SLI but that crap about nVidia GPU is BS, all games supporting nVidia TWIMTBP needs to say that in FAQs, thats what the money for, I've seen my friends use all GPUs from 8400GS to GTX280 and X1950XTX to HD4890 and Crysis scales exactly according to the card's general performance, just like HAWX DX10.1 scales well with ATI cards not for ATI preference but for DX10.1 optimization and ATI driver support.
Well, we all have our opinions but just my two cents: Read This; *tinyurl.com/ydq9ogr You may call it cheating but this is how most performance is coming out if the nVidia drivers.
Well change your PSU. That PSU wont suffice for the new GPU. It will certainly fry your PC in 3-6 months!