Been reading and the consensus is ATi drivers are better than nVidia drivers for Mac OS X. The 285 has 1Gb memory but it's DDR3 v. 512Mb of DDR5. I don't know the bus bit size, but taking everything in consideration, I read that the bottom line is bandwidth not that DDR5 is better than DDR3. Which card has the bigger bandwidth? Since I don't have the MP yet, it's $450 for the nVidia 285 card or $180 to upgrade to the 4870. 450-180=270 but then I would also have the GT120 to sell. Perhaps I could get $70 for it, then it's a $200 difference between the GTX 285 versus the HD 4870. GTX 285 worth $200 more than HD 4870? Given nVidia track record, will they in short time improve their drivers to get the most out of the 285? Last question: EVGA makes/produces the GTX 285 Mac Edition not nVidia, they just pay nVidia for the design specs? Been reading that nVidia manufacturing quality has been sloppy in the past, is EVGA better at quality control?