Daedaless

Hi, I am interested in buying a USB graphics adapter so I can hook a third monitor to my existing dual monitor set up without needing to install a second graphics card. I have one graphics card and already have three monitors at home (2 of them are attached to my computer already). I was wondering if I can use a USB graphics adapter to attach my third monitor even though I only have one graphics card. If so, how will the quality of games on all three screens be affected? and can you send me a link or recommend an inexpensive but good graphics adapter?
I have a nVidia GeForce 7950 GX2 1GB PCIE graphics card.


Also, as a backup plan if that doesn't work. I am trying to use maxivista to use the moniter of a second computer as my third moniter, but I am not sure how to connect the two computers. (What material do I need? Do I need a CAT 5 cross over cable?)

Lastly, if none of those work, can I just buy a cheap PCI express graphics card so I can hook up my third monitor to that? If so, can I span a game across all three screens? how would the graphics be affected? Will I need to upgrade my power supply to the computer? Any PCI graphics cards you can recommenced?
my motherboard is: FOXCONN NFROCE 590 SLI MOTHERBOARD. My power supply is 650 Watts

Daedaless

bump, please help me