Yeah it was the mac one -- you can see pictures of it on the first post
I got it to work with 3D application such as Modo, Blender, Houdini and an in-house OpenGL gaming library I was working on. But I just didn't notice any performance increase worth mentioning -- at least for me on a dual quad 2.8ghz mac pro. Disappointed, I returned the card and went back to my 8800GT.
I'm not saying that its a total loss getting the 4800 but its one of those things where you get you get very little for your money, compared to any other upgrade you can do to your computer. And given OSX is all OpenGL bases most gaming cards can offer you almost the same quality for a fraction of the price.
You didn't extract the EFI, isn't it? :/