CrossFire is the new dual graphics card system from ATI. It offers remarkable image quality improvements for game play and 3-D work.
People who demand the absolute highest levels of performance have tried every possible combination of CPU, motherboard, and graphics card in their gaming rigs. While results have often been excellent, there are those who are still unsatisfied.
In an effort to push beyond previous limitations of the PC, ATI has turned to the technology it uses in commercial flight simulators, creating a double card system. The new system can deliver …

3-Way NVIDIA SLI® - the fastest PC gaming solution on the market - is available today. This new technology is currently supported on NVIDIA nForce® 680i or 780i motherboards with either three GeForce® 8800 GTX and GeForce 8800 Ultra-based graphics cards.

read more | digg story
From Wikipedia 
NVIDIA has also revealed a triple SLI setup for upcoming nForce 700 series and existing nForce 680i series motherboards. The setup can be achieved using three high-end video cards with two MIO ports (currently only for the 8800 GTX and 8800 Ultra) and a specially …