So its come time to upgrade my video card (running an 8800GT right now) in my Mac Pro 1,1. My understanding from snooping around the forums (here, and netkas) is that a 6870 will run straight out of the box (on Lion). However there is no boot screen, no DVD player, and no Steam games. 3 quick questions, 1. Its the Apple DVD player software that doesn't work right? Using VLC will still work? 2. Steam games still work on Windows right? 3. The 1 GB or 2 GB cards both work right? I'm hoping for a 2gb XFX 6870. Thanks for any help! Oh, and I can't flash because of the 64 vs 32 bit incompatibility right?