One of the best sites I have found that allows you to do relative or comparativeperformance analysis is Stockcharts.com. (In the interests of full disclosure, it is partially owned by two old friends John Murphy and Greg Morris).
Though I have never been convinced that comparative periods of performance have any predictive value, I think comparing chart patterns from different historical time frames can improve our perspective.
Honestly, this article is less a review and more of an attempt to convey my surprise and satisfaction at the performance and comparative value of the newly released GTX 780.