Re: Lets say...
the 17" will have a lower resolution, so yes, it will have higher framerates. but it wont look as good. so, depends on wether you want high performance or great resolution. a 4850 should drive a 24" in most games no problem.
plugging in the second monitor will not affect the first. but you have to set up the second monitor to be able to use it, plugging it in and turning it on wont really do anything. you have to dictate which monitor is primary etc etc.
"nagasama no longer drinks tecate, or streaks out of the night for anything, and he has a fine wife so he has no use for your girlfriend...she is safe..."