Today we are looking at two cards, the XFX HD 4890 Black Edition and Zotac's GTX285 Infinity. Both are each respective manufacturer's fastest single core offerings and bring several improved features to the table. The XFX Black Edition contains a 1GHz core (150MHz increase over the reference card) while the Zotac GTX285 Infinity is supplied with increased clock speeds and a preinstalled waterblock for unmatched thermal performance.