http://arstechnica.com/news/posts/1084398037.html
Those were the days with 2x Voodoo² in SLI
2 Radeon X800 kaartjes in je pc in de toekomst?Readers on the floor of E3, with whom I've been in communication, have seen this running in an alpha state. This is not vaporware. This is not a multi-monitor technology, either. The current implementation splits the screen in half, assigning rendering for each half to one of two cards using a software load balancer to try and ensure proper synchronization. (You may recall that 3dfx's SLI technology split the workload by alternating lines. This is a slightly different approach.) The motherboard is being produced for Alienware by iWill, and Alienware is currently saying that they expect users to see a ~50% performance boost over single card implementations.
Those were the days with 2x Voodoo² in SLI

