Hi,
It seems that a Mac Pro is Intel based and official which means there is EFI and TPM (trusted platform module chip on the mobo) which may prevent a PC PCI express card from booting but try it anyways if you have one. I personally perfer mac to windows but I rather use a *acked version because, 1. it is way less expensif than a Mac Pro, Macbook or any mac Hardware, and for the price I get lotz n lots of performance. My X1950XT benchmarks in Osx86 @ 117 (xbench) and the total pc @ 85 so it meets my needs. If Apple had more software, i wouldnt use windows but there is 3d max, endorphin, vegas video, and other that is keeping me hooked to the (r) Microsoft Teet(c) But then I use Mac to do audio in Logic Pro (formerly for Windows) and I love the Ilife suit, Aperture and Finalcut Pro!
Jccool