I play with a 2011 Macbook Air, 4GB ram, 1.7Ghz i5, Intel HD 3000 graphics. The one that's not supported. It works, but is unbearably slow. So, I play in strategic mode only (no graphics, makes it look like a barebones boardgame), which I'm used to now.
You should get better mileage out of your superior system.
Just don't upgrade to Mountain Lion. Yet.