So I got the 6870 and it's a gr8 card, works beautifully with my Mac Pro 1,1. I applied the ATY_Init.kext thing thing and that all worked fine, Steam works perfectly etc... Though before I ran ATY_Init.kext with Kext Helper the card was showing as 2GB ram (as it should) in "About This Mac" but now it's showing as 1024MB ram. I presume that's just a false report due to the ATY_Init.kext being written for the 1GB version of the card and that the 2GB on my card is still available to my system right? Anyone know more about this? Cheers! BTW kudos to all those making these cards work on Mac Pro, it's amazing work and you're saving people a fortune. Gr8 stuff!