I am curious about the USB 2.0 Video card unit you have. I am trying to run 3 monitors on my Dell Vistro 260 and already have a card that will run 2. Do I need to add 3 of these to the computer if I want to run 3 or can I just purchase one and then use the existing dual monitor card?
Thanks for your question and for considering a Plugable adapter. With your dual-headed video card providing output to two external monitors, you would need olnly one Plugable USB graphics adapter to add a third monitor to your system.
Let me know if I can answer any more questions about any of the products at http://plugable.com/products. Thanks again for your interest.