hey guys I have a 8x2.93 with 2 x 30" apple displays & the ati 4870. I have the displayport to dual-link dvi adapter to use both monitors. The monitor connected to the dvi port on the card is fine. The monitor connected via the adapter occasionally 'flickers' or kinda turns on/off very quickly. It's very intermittent. Often will go hours without doing it, but regularly does it 3-5 times a day. I've tried swapping monitors around, and the problem follows the adapter. I've also got a 2nd adapter here spare (that I sometimes use for my laptop) that I swapped in as a test and the same happens. Smells to me like a firmware bug. I rang apple and amusingly they told me to run the vga firmware update. I told them it was not vga and they told me I still needed to run it. When I ran it of course the updating program said "no vga displays connected". Real smart advice there. They are looking into it and said they might be 5 days. EDIT - both monitors work fine on my old macpro in dual display, the late 2006 model. it's something with the stupid adapter.