Yes, you could run the second monitor off a separate video card. I do not know if it would fix your problem. It might create other problems with two different brands of video drivers installed. Remember you would need a mainboard with three 16x slots. Alternately, Matrox makes a one lane dual head card you could use.
I doubt Ultramon would fix your problem. It is not free but it does have a 30 day trial so there is no harm trying it.
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