SLI vs. CrossFire - Part 51254
 

With the recent release of CrossFireX by AMD/ATI and 3-way SLI by nVidia we think it is a good time to make a technical comparison between all incarnations of these two technologies, which have the same goal: to allow video cards to be connected in parallel in order to increase gaming performance

http://www.hardwaresecrets.com/article/391