Probably not officially, not after this last release of the EFI 7950 and GTX 680, but that's just my thinking. My current workaround is to run one display off the (less than adequate) EFI card that shipped with the Mac Pro, and use a PC card to run my main display and graphics acceleration. That way I get full power with support for up to 5 displays, and an EFI boot screen. And of course, MacVideoCards is always a great option. Quality products there, friends of mine have been more than happy with those cards. Absolutely second that recommendation from sunnyj.