When a new product gets launched we always see a bunch of reference designs that change in nothing but the sticker for a while. Gradually as the product matures we start to see factory overclocked models and eventually ones with non-reference coolers.The ASUS Top range has always been one that combines both elements of a factory overclock and a non-reference cooler to potentially provide one of the best performing models of that type around.Of course the model that you start with has a large bearing on the quality and performance of the finished product, so we were delighted that the latest in the Top range is based upon the Radeon HD5850, a card we've already tested in stock format and found to have plenty of overhead available if you're willing to tweak.