1. Both are ATI Radeon 5970s, but different manufacturers.
2. Yep. They only started working once I Crossfired the cards.
3. No - I did see in CCC that both were running at x8 without Crossfire, but haven't looked since they started working.
4. Just a different manufacturer. Nothing else.
I have monitors plugged into both cards. With Crossfire on, the second monitor is blank. Don't need the dummy plug...
Over on the TM boards, Farscape said that he has run into this issue when he tried to do a dual 5970 setup. He found some reference on the XFX website that most Mobos aren't built to handle that high-end data transfer - he ended up having to get a new Mobo. In a last ditch effort to not buy a new Mobo (and thus thwart STM
) I turned on Crossfire, and things started working. I really have no idea why, but it worked...