Hello guys, first time posting, I have been reading a lot about my Mac and some doubts arised. Firstly I am having trouble with mavericks, I have a late 2008 macbook pro with the aluminum body with 5 GB of RAM, today I plan to upgrade that to 8 gb. The problem being that some games that ran well in snow leopard (like COD 4, BioShock, Torchlight and Half life 2) now run slower and some of them crash suddenly, will this correct this? If not I don't mind switching to snow leopard 6.7 again (or get mountain lion) Also, I read that my Mac has an NVIDIA GEOFORCE 9600M video card, but when I go to the about this Mac page it only shows the NVIDIA 9400M card, so I don't know if I do or don't have it, if I do, how do I switch between cards? I'm planning on installing diablo 3 very soon and would like to know if I can even run it (after I upgrade to 8gb of course). Thanks!