I have a 2010 iMac 27" i7, the 2.93. Has the ATI 5750 1 gig card, and the stock 4 gigs of RAM. I've been playing more games now with bootcamp installed, and more games being available through steam / app store. my question is, is it worth it to upgrade to say 16 gigs of RAM ($150 from OWC) ? is there a noticable difference in gameplay since it's still a 1 gig mobile graphics card?