This is my MAC pro (mid 2010): I see more and more games for 10.7 and 10.8 only, soon enough, people say september 10.9 will be out...for using gmail and facebook a change of OS is not really needed, but I'd like to game.. Is upgrading the solution? For running XCOM:Enemy Unknown minimum requirements so even if if upgrade my lame graphic card will stop me, because I don't have 8GB RAM! if yes, to which system upgrade? is it worth waiting 10.9? maybe for gaming purposes 10.7 is actually better than 10.8, or there is no expectation that 10.9 will be worth waiting for gaming.. I hope you can help me make my mind!