I have has this quad core Mac Pro for a few weeks now, and I finally got around to buying another 24" monitor for it. Now that I have two running at 1920x1080 each, the animations for expose, dashboard, and spaces are lagging (seems frame-rated). I have tried switching the monitors' DVI connections on the mac, but to no avail. Has anyone been experiencing this as well? I am pretty sure it is not the lack of power of the standard GeForce 120 that's in this machine, it should be more than adequate to handle simple GUI things. any advice?