ummm ... you have to be saturating your video busses, you are using the onboard video and two video cards on the pcie buss. There is no way you can move all that data back and forth. YOu are asking your processor to do 3X the work of what mine does for 6 wows ...

This set up is not resonable. YOu need a better plan, in my opinion, but others might have better ideas.

9800 is a strong video card but your computer is just not able to get the information to the 3 places in time.

Make another similar computer, take the 9800 out of your current and move to it. Have 2 computers running 4 wows, and dont use the onboard video.