Ok so I am running 1 account on my main screen that also have its own video card 8800gt I have it set to 25 maxfpsbk and maxfps 65

Now I have the same set for the other 3 accounts on the other 8800gt and they seem to be getting just a little less frames per second at around 33-41 however my Mainscreen looks a little choppy

What is the optimal set up for my system?