I've read a few threads about upgrading a Mac Pro with a ATI 6870 card and flashing it. I have a few lingering questions. 1. What current bugs and issues are there with a flashed 6870 on a 2009/2010 Mac Pro (assume 2009 was updated with 2010 EFI). I initially read about steam issues, dvd player not working, etc.. But it seems flashing the card fixes most of these problems. What are the issues remaining on the OS X and Windows 7 side of things? 2. On a 2010 Mac Pro, does Audio over HDMI work in both Mac OS X and Windows 7 with the 6870 card? I know it works for 5770 and 5870. Does it still work with a 6870?