NVIDIA's Quad SLI Technology Review - Performance and Quality
When Nvidia realized that two graphics cards couldn't always do the job, they moved to Quad-SLI. While the money needed for a Quad-SLI system is beyond what most people are willing to pay for a gaming rig, there will always be those looking to have the best of the best, regardless of the cost. Whether you're seriously interested in obtaining this technology, or you just like to dream, PC Perspective takes a fairly in-depth look at Quad-SLI and what you can expect from it.
* Update: [H]ard|OCP has a similar article on-line today as well.