I have been using FSX with an ASUS EAH5870 Eyefinity Card which has worked quite well by itself. I have it set up with 3 23 inch displays (2 DVI, 1 DP). I added an ASUS 5750, and have had trouble getting more than one display to work on it with Eyefinity working on the 5870. My base rig is a i7-920 slightly overclocked with 6 g of memory, a 40GB SSD and a 500GB hard drive. I can get two screens to run in clone, but would like to get two running as a second Eyefinity. It appears from other forums that only one card can run in Eyefinity at a time. I would like to run the two displays on second card to display instrument panels, and have only been able to get one to display. Any insights?