Nothing apart from the product id which tells the drivers to list card as a x800 xt platinum edition as apposed to just x800 series (as well as the clock speeds). Memory timmings is same on both cards and in fact after downloading nearly all pro vivo, xt and pe agp bioses, all of them stick to atis reference memory timings. Was hopeing to find a cool one like the gigacube on the 9800 with different timmings to clock higher.