If the video chip is good enough, G4.5 will fly reasonably well, especially with photofields.

Off topic: I am running several versions of Windows (XP, Vista Ultimate 64, Server 2008 64, and Windows 7 Ultimate 64), MacOS 10.5.7 (one on a genuine Mac mini and one on a PC, i.e. "Hackintosh", which makes a better and cheaper MacOS platform than Apple hardware), as well as Linux (64-bit Ubuntu 9.4). I must say that Linux impressed me the most, way better than Apple's lame Leopard. But no matter what one's OS preferences are, the fact is that neither Mac not Linux have decent RC flight simulators. So, Windows is the only way to go. Windows 7, that is. It even runs on older hardware and does it quite well. Even good-old FMS flies in Windows 7 like nobody cares!