I recently upgraded from a ATI4890 to a Sapphire Vapor-x 5870. In my case, noise was the biggest factor. The 4890 was great but too loud. The Vapor-x 5870 gave a modest increase in performance but was significantly quieter at the same operating temps. I won't move up again unless noise and temp levels can remain similar. BTW, I game at 1920x1200 and all games at very high settings.