Quote from silver914:
The BIOS does not determine the number of monitors your system can handle, the OS does. I can't remember the number exactly offhand, but a windows based OS can handle somewhere in the neighborhood of 24 monitors.
My immediate concern would be the expansion slot converter you plan on using in order to get the second video card to work. I have found such devices to be buggy at best. Then again, maybe yours will work great.
Have you looked at all of your options for using multiple displays, or are you simply trying to use what you already have?
I am trying to run with what I have but I am also prepared to do whatever is needed to run 8 to 12 Monitors.