I have a fairly old desktop, that has a GeForce 5200 OC (AGP) with 2 screens. I wanted to add 2 more, so I got an nVidia PCI video card (can't remember the model) since the machine only has one AGP and a couple PCI slots. (Can't afford to upgrade. The screens were dirt cheap.) However it doesn't want to work at all. I don't think the motherboard is capable of doing both PCI and AGP video at the same time.

However, I also have a web server running 24/7 in the same room, which has no need for its own X server. If I put the PCI video card in it, could I set it up as a client of the desktop's X server, plug the other two screens into it, and have it work as though all four were on one machine?