Just bought a couple weeks ago, 2.8ghz 8-core Mac Pro. My only complaint is the wimpy 2600 XT that it came with. I know I could put in the 3870 or 8800GT but that would be a step down from my windows pc that I just switched from, which was running 4850. I've heard the rumors that Mac will soon support the 4800 series ATI cards but my question is will the card work on my current Mac Pro or would this upgrade only be for the new Mac Pros that everyone is guessing will come out in January?