What is NVIDIA SLI technology? How does it work?
NVIDIA® SLI™ technology is a revolutionary platform innovation that allows you to
intelligently scale graphics performance by combining multiple NVIDIA graphics solutions in a single system with an NVIDIA nForce® SLI media and communications processor (MCP).

How much of a performance increase will I see with SLI technology?
The amount of performance improvement will depend on the application and its ability to scale. Several of today's hottest games see a full 2x increase in performance when using
SLI technology with two graphics cards. In general, applications running at higher
resolutions with higher image quality settings will benefit most.

Why is an SLI-Ready PC an Intelligent Investment?
An SLI-Ready PC consists of an NVIDIA nForce SLI motherboard and one SLI-Ready graphics card, thereby having the ability to be upgraded by adding an additional graphics card in the further. No other PC component upgrade can offer even close to the gaming performance boost gained from adding a second card.