OK, potentially silly question... and I hate to be a help-leech, but I've searched far and wide and haven't found a solution. Finally got my Sapphire 5870 Vapor-X hooked up to my 2009 MP... and been trying to get it set up so I don't have to pull the old GT120 GPU out of the PCIe slot every time I want to boot up in Windows Vista x64 on the 5870. The GT120 still boots up beautifully to OSX with the 5870 in, but I can't seem to get the 5870 as default on WinVista64. My guess is it has something to do with the EFI, as I get the gray "pre-apple" screen when I boot with the GT120, but not with the 5870. The 5870 only starts to send out a signal once the Windows loading screen shows up. I'm trying to completely (or at least effectively) disable the GT120 in Boot Camp/Vista x64. Is it even possible without a BIOS? I've already tried disabling the GT120 "Display Adapter" under Device Manager. Am I missing something else that is glaringly obvious?