I have a Mac Pro 1,1 with Lion, and it used to have a PC Radeon 4870 in it. The card died a horrible death this last week and I've had to reinstall my old GeForce 8800 GT. Well my 8800 has problems of it's own, and it's also a quite old card by now, so I'm looking at my options for a new video card for the Mac. Looking around I see people are successfully using Radeon 6870s out of the box with Lion, with the caveat that the boot screen doesn't work. I also see some people are having a less than perfect experience. And then there's the work people did to make PC 6870s work with Snow Leopard. Does that matter with Lion? And then there's the 5770, the 5870, the 4890, the 6770...not to mention Nvidia cards. So, can anybody explain for me in clear terms exactly what the options are for a Mac Pro 1,1 with Lion? If the 6870 works, exactly what models are working? Can cheaper models like the 6770 and 5770 work? What does it take to make them work? Would trying to find another 4870 to flash be the safest option? If so, where do you find them for a reasonable price? How well do the Apple 5770 and 5870 work with a 1,1? Are there any other cards I should consider? I'm looking for an easy, cheap, and safe option for getting a new card for my Mac. I appreciate any help you all can provide.