Ok, I just bought a 21,5" imac with the stock HD 4670 ? Will there be a very big demand in the OS graphics ? Or Will it run as smooooooth as it does now ? I am making this question because I used to own a late 2009 mac mini and the graphics were so sluggish! When I bought this iMac I could't believe how smooth it was and I don't want to lose it ! And, if there will be a major OS new tool, could you guys guess what it would be ? Thank you !