If I have my second monitor enabled and play a game it becomes very choppy. Disabling the second monitor makes it smooth. Is there a reason for this and can it be fixed?
No it's not in windowed mode. Crossfire works and all but it feels choppy, probably that microstuttering thing people are talking about. Disabling the second monitor makes it feel smooth.
Have you tried switching Windows theme to a basic theme without all the graphical effects? (assuming you are using Windows 7 or Vista). If it doesn't automatically switch, try changing it manually to disable the Aero theme effects.
Are you getting stutter in all games or just one in particular? What kind of frame rate are you getting when it's noticeable? You do have your monitors connected to the top (closest to cpu) card right?
BF3, Mirrors Edge, RO2, all do it. Something weird I noticed with mirror's edge was that the frame cap would be 62 with my second monitor enabled and 60 without it. I'm using crossfire but in windowed mode it does the same thing. No readeon pro.