OK, Your system must be good enough.
I have this running on one computer with one video card.

Not shown in that picture is a
DesktopAviator GPS that I added later. That makes a total of six monitors, not counting the Saitek instrument panel.

So I guess that you system can't handle another monitor? If that's the problem, there are easier & cheaper solutions.
Read this -
Who wants another monitor!And this -
A minor update on the Plugable USB to VGA adapter.The FPS isn't bad either.
