In case anyone needs more data, I'm running on my Mac Mini that I bought about six months ago. Windows 7 via bootcamp. DX10/11. Plays slow with graphics on all high, but still playable. I have everything set to medium and I've found that it's just fine. Clouds, shadows, pretty water, etc. Now, the game still seems slow loading and in between turns, plus Civ5 just plays slower than 4 (my opinion so far). Other than than, it works acceptably.