Ive never ran a dual display setup before but my friend wants to do it. He wants to run 2 20" Lcd's off an 8800gt. Will you take a performance hit in games doing this displaying on both displays?
If it worked yes it would because obviously he would be running at twice the resolution. Dual displays on gaming cards is only for 2d work though, used to sorta be able to do it in profiles but cannot find it in the new control panel for nvidia. So as it is you boot up a game and whatever is secondary will just remain at desktop. If he set the display to clone then there would be no performance hit, but being cloned no point to it either.
Unless the game used both screens I doubt there will much of a performance drop.
I had a laptop with Readon 9000 64MB and I paired it with a samsung 245B. Ran Warcraft 3 on that with the laptop screen displaying the desktop with speed fan and what not.