Sapphire has introduced another graphics card to its range, the HD 7950 Mac Edition. Designed specifically for Apple Mac Pro series of desktop computers, the card sports 1792 Stream Processors, a core... Sapphire HD 7950 Mac Edition Graphics Card
The bios aren't for the efi that apple uses for their macs, it'll work under a windows environment in a Mac Pro, but that's it. You can flash some cards, but it's picky on what card you use. Netkas in the Mac community is big on this, don't have a link to it but check his site out. Or people use chameleon to boot the cards up.
First and only warning. We aren't starting a flame fest here. Besides, this isn't apple pricing it either.