I love that there is finally a 3GB GPU option for OSX, i wish there was a 4 or 6, but give us a new mac to put it in! The current architecture of the mac pro and its OS ham string the cards performance. (PCI 2.1, Opengl 3.2, The DDR5 ram is probably bottle-necked by the bus speed of all but the latest MP's among other things) - diminishing returns probably sticking it in 2008 mp, though it likely would work in a 1,1 2,1 and 3,1 MP.