I had been recounting my experience in an earlier thread (http://forums.macrumors.com/showthread.php?t=747826] ("Need a good laugh?") Several responders asked why buy the 2nd 4870? In the last 2 weeks before my MP shipped, I've asked 3 Apple Geniuses at Apple stores and Apple Tech support about running dual DVI 23" Cinema Displays with 4870's. They ALL said I would need a second card. When I attempted the install, there were only 2 power cord clips on the back face of the main board. Both being used by the onboard Radeon 4870. What to do next? Another call to Apple support offered me a nice Indian girl who I could not really understand. Finally, I called a local non-Apple shop that I frequent for hardware and service issues. The very nice service tech told me to take the 2nd card back, since that original 4870 will drive 2 monitors perfectly, in my case, with a simple Mini DisplayPort to DVI adaptor for the 2nd 23" display. Can anyone confirm this? And it brings to my mind, how would you install any 2nd graphics card, if a 4870 takes up both power clips?