For the most part, that's true. I'd just go with windows 7, however, as it's the newest OS, and is actually still being supported, and I imagine fairly soon MS is going to drop support for XP altogether. I've played several older games on mine in windows 7, and the only problem I have come across is that some of them don't like 64-bit. If you're using it strictly to play games, I'd use 32-bit w7. It won't slow down the Mac portion of your system at all, provided that you use Boot Camp, rather than virtualization software. You should use Boot Camp for gaming anyhow, as games don't run well in a virtual machine.