The mac found the drivers on it's own.
I've been googling around but I can't seem to find any downloadable drivers for the Asus VH242H??
I tried a semi switch. I disconnected the Apple monitor and used the Asus as the only screen. The lagging seemed to disappear.
I will try to use the Asus as primary and the Apple as secondary later today and get back to you. (I simply forgot to do this when I did the semi switch
And yes, only one 8800GT card.