Does anyone know what the hell "Make Preferred" does? I can make any one of my three monitors the "Preferred" monitor in Eyefinity. The only change I notice is a change in input lag. It's hard to explain but it seems making a monitor preferred actually adds a bit of input lag.
A Google search comes up with nothing of note:
http://www.google.com/search?hl=en&q=eyefinity+%22make+preferred%22
Also, my monitors all seem to say they are 0x0 resolution when in Eyefinity.
Strange...
Perhaps I will take a video later to try and demonstrate the input lag issue.