How about you just give me the other two monitors and be happy!
You would need SLI if these cards were to work together which would require two PCI slots. And i dont think the 7900gsoc has SLI ability (not sure). Oh and you would need a like 450w or higher psu i bet..
really you need a forum vet to answer this question because i only specialize in the ge force 8 series and above..