2 accounts, one computer

[Zorthaz]

Hello all,
 Has anyone put two video cards in one box and had 2 copies of EQ, each running against two different cards?  Can you comment on the performance?  I two box using two computers and a KVM switch, but I have to go down to one computer.  I was wondering if the second video card would allow me to see both character's displays without killing performance.  I was using EQW with 2 800x600 windows on a 1600x1200 desktop.  I would like to add a third window/toon from time to time.  Has anyone run three EQW on a single box?  What was the performance and what was your setup?
Thanks