I'm running a 3x2 viz wall with DisplayPort monitors, so no adapters. We started with an HD6870 Eyefinity 6, quite happy. Decided it was time to update to a more powerful card (HD7970 Eyefinity 6), and now I'm on my third card from VisionTek, same problem each time. Running Windows 7, a few programs have serious dropout problems to whatever monitor is plugged into port 1 (my test program is Microsoft Surface Globe, from the Microsoft Touch Pack for Windows 7). I've tested with the very latest drivers, and rolled back to older ones as well - no luck. Anyone have suggestions?