As we mentioned in our introduction, ASUS' EAH3870 TOP utilises ATI's reference, dual-slot cooler, choosing only to deviate with regard to clock speeds. From a reference core clock speed of 775MHz, the EAH3870 TOP sports a clock of 851MHz, giving it a 76MHz boost in that discipline - An odd number I know... Why not 75MHz? Meanwhile, on the memory front we see only a small increase, up to 1141MHz over the 1125MHz of a reference Radeon HD 3870 part.