I did some quick googlin, and couldn't seem to get a definitive answer. Will Mac OS 10.6 (Snow Leopard) work at all with a mac-friendly EFI Radeon 6870? If the answer above is yes - then whats involved? And how tricky is this, in a nutshell? To put this is perspective, I'm considering getting a used/refurbished 2010 Mac Pro with 10.6 once the newer 2013 era Mac Pro's are released, and the prices come down. I've always really liked the current case design, and actually prefer 10.6 snow leopard for the desktop macs (I already have 10.8 on a budget 13-inch macbook, where I feel the newer interface is actually worthwhile). I will use Windows 7 for the windows side. This will be to replace a 2008 era iMac with a build-to-order 8800gs.