How does the iMac NVIDIA GeForce GTX 675MX compare to Desktop cards? I'm considering buying a new iMac and am wondering what the GTX675MX will do (have a hard time finding comparisons or tests with that).  I plan to use it for gaming (part with bootcamp/Windows7 if games not available for MacOS)

I think it's a mobile card and with the space restrictions it can't have the same power as (lets say) a PC GTX 670, so next to which PC GTX cards does it fall (I have a GTX 560 in PC for example which now tends to move towards falling down the cliff on the weak side).
DO NOT GET the imac 680mx!!!! save and get 675mx same performance but with less cudas
1344 and 1 less gig of vram. Still running battfield 3 ultra 43fps 1440p
check this site http://forums.macrumors.com/showthread.php?t=1568279.