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"What is SLI?"

From Shane McGlaun,
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Definition: SLI is short for Scalable Link Interface. SLI is proprietary to Nvidia graphics cards and is a method of allowing two graphics cards of the same model to be linked and share the load of rendering the graphics on screen. Using two graphics cards linked via SLI greatly improves the performance of the system by rendering the graphics faster. Often up to a 2 times improvement is seen.
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