So after being on the phone with Apple for about 2.5hours I was told that the Nahalem doesn't asupport 2 buss powered Graphics cards. Is this true, or am I missing something. I have spent quite some time doing research on the issue of Flashing and what needs I have versus con, and so I bought a 4870. Now I'm told that my Mac Pro only supports one of them. I should also mention that I had purchased a Mac 4870 3months ago with my Mac. So whats the deal, is this gonna work, or am I screwed?