It may surprise some PC Fanboys but on a tower based Macintosh Pro, you cannot just throw any old graphics card into that machine install drivers and expect it to work, Oh Noes. It is like this, Apple tests hardware in small quantities that works with its hardware, engineers samples that Apple will sell as configurable items shipped with sales of new machines. You might get a choice of 3 cards in total with a new machine. After market pickings are even slimmer, and completely dependent on AMD/ATI who have to purpose build and ship a Mac-only version of a graphics card that might be slightly newer or faster (usually not though) version of a 2-3 generation old PC graphics card. It’s insulting. But hope springs eternal, and I see this news story as a ray of light for the Mac Fanboys.