I recently purchased a 23" widescreen, native resolution 1680x1050. I have connected a 17" flatscreen as a second monitor to watch video, play music, etc. through my 8800GT second DVI output. What I notice is, in some games (e.g. Left 4 Dead 2) that there is a significant performace hit - game unplayable - when the second monitor is on even when not being used except to display the desktop background. Other games (e.g. Far Cry 2) are uneffected. When I switch to single monitor mode - just the widescreen, it's all good. I know my 8800GT is getting long in the tooth, but is this normal? Not sure if there is something I can adjust (other than springing for a 5850). Thanks.