Just for testing purposes, I installed a spare drive and put Windows 7 Home Premium x64 on my Mac Pro 1.1 last night. All of the advice given here on MacRumors so as to install the 64-bit version and get the AHCI working properly went flawlessly with one exception: Boot Camp doesn't like to restart in OSX from Windows after the AHCI patch. But the big issue is: Windows 7 Home Premium continues Microsoft's policy of not supporting multiple processors on any "Home" variant of Windows. (XP, Vista, 7) Task Manager reports only the two cores of the first CPU and ignores the second. To me this isn't important as I intend to continue using XP Pro for my rare ventures into Windows but is important for Mac Pro users considering purchasing Windows 7. If you wish to use Windows effectively on a multi-CPU Mac Pro, you must obtain the "Professional" or "Ultimate" versions. Have Fun, Keri PS. ahhh... nevermind!