I am replacing the video cards in my dad's computer (he had two GeForce 6200's previously), so i ordered two GeForce 9600's for replacements. The thing is, I didn't check his mobo to make sure he had two PCI-E slots. As it turns out (big surprise) he only has one PCI-E slot along with two regular PCI slots. After looking around on newegg, the only PCI video cards available in the 9000 series are 9400 and 9500.
So my question is, can I just order a 9400 to use with one of the 9600's? I know for SLI to work you have to use the same card, but the PCI cards aren't SLI compatible, so that's not even an option.
It also might be helpful to know that my dad uses a quad monitor setup.