Quote Originally Posted by Natalia View Post
From what I understand and have heard, with Crossfire, you can run Windows just fine with dual monitors, but once you start a game, one turns off.
I've heard contrary:

Happily, though, AMD's newer drivers pretty much blow that limitation away. They've delivered the "seamless" multi-monitor/multi-GPU support AMD promised at the time of the Radeon HD 3870 launch. Here's what I was able to do as a result. I connected a pair of monitors—a 30" LCD with a dual-link DVI port and an analog CRT—to a Radeon HD 3870 in a CrossFire pairing and enabled CrossFire. Both displays continued to show the Vista desktop with CrossFire enabled. Then I ran UT3 and played full-screen on the LCD. The CRT continued to show the Vista desktop just fine. Next, I switched UT3 into windowed mode, without exiting the game, and the transition went smoothly, with both displays active. Finally, I dragged the UT3 window to span both desktops, and it continued to render everything perfectly. Here's a screenshot, wildly shrunken, of my desktop session. Its original dimensions were 2048x1536 plus 2560x1600, with the UT3 window at 2560x1600.
http://techreport.com/articles.x/13967/3