I have a 13" Macbook Unibody. I'm not sure what model it is, but I got it in late January 2011, and it was (might still be) the latest version. Well, I'm not sure of what I'd need to say... I'm running Mac OS X 10.6.6, I have a 2.4 GHz Intel Core 2 Duo, an NVIDIA Geforce 320M graphics card, and 256 MB of VRAM. If there's anything else I need to tell you, please let me know. So, the question... could I run Civilization IV or Civilization V better? I'd be purchasing from Steam.