Source: Experience I own a 27" iMac and have my 1TB harddrive partitioned 50% Lion / 50% Windows. I game on both operting systems, such as Diablo III on Lion and DayZ & Guild Wars 2 on Windows. I run these games at the highest settings better than most PCs I have seen. And yes, I was a PC owner up until a few months ago. I used BootCamp to partition my harddrive and used Windows 7 as my operting system. Do NOT use Windows 8 yet! You have been warned. I followed the normal installation guide here on the www.dayzmod.com homepage and use Six Updater everyday for updates and to launch the game. So to answer your question, Mac can and most certainly will run DayZ.