nVidia showed off their dual GPU SLI (Scalable Link Interface) technology at the Fragapalooza LAN party in Canada on Friday night in front of a bunch of gamers. Lyncoln from Bjorn3D was there and took a short video of the demo as well as posted short coverage of the happenings, here.
In their presentation to the attendees at Fragapalooza they went over the technology and the fact that the SLI naming doesn't have anything to do with Vodoo's own SLI, it only shares the name "SLI". Vodoo's SLI tech stood for "Single Line Interlace" and each GPU was responsible for drawing every other line on the screen. The nVidia technology is completely different and stands for "Scalable Link Interface" and essentially one GPU is responsible for drawing either the top or bottom half of the screen, but not quite because with the alogorithms in place to make sure each GPU's shares an identical work load it can end up with one GPU drawing the upper 1/3 of the screen consisting of a heavier graphics load while the other GPU draws the bottom 2/3 of the screen with a lower graphics load.