Hey guys, I can confirm personally that the 6870 does work in Mac OS X in the 1,1s without flashing using the downloadable drivers. The model I got was an XFX for $200 from CompUSA. Geekbench and DVD Player don't work (oddly enough) but everything else does. I tested it extensively in Aperture, and I've been playing STO with it in Windows 7 64-bit (all settings on high, in HD, with 8x AA). Hope this helps if any one was wondering.