In my earlier article on the MSI HD 6870 Video Card I confirm that the ATI Radeon HD 6870 Video Card works in an early 2008 Mac Pro and how to install it. Upgrading to Mountain Lion appears to have no effect on the way the graphics card interacts with the Mac’s OS. I was able to upgrade from Lion to Mountain Lion with the card in the computer. I then tested each of the problems previously reported with running with this card.
Current Non-Critical Issues with the ATI Radeon HD 6870
1) DVD Player – Crashes on start-up – Download VLC Media Player to play DVDs. This works fine on my system.
2) Slow Frame Rate after Sleep Mode – If you put your computer to sleep or it auto-sleeps the frame rate will be half to 1/3 after you wake the computer. I haven’t found a resolution for this yet.
3) Start-up Screen Doesn’t Display – This still happens, but doesn’t seem to cause any adverse affects. In the comments of my earlier post there is a comment about moving to the top DVI port. I tried this but apparently only works if your card is flashed. Mine isn’t.