Not content with producing one of the finest Athlon coolers known to man in the form of the MCX462 Swiftech decided to unleash the MCX478, their entry into the high end P4 market. Rather than design a whole new heatsink from scratch however, Swiftech have simply built a conversion kit for the MCX462. Bolt on two 'wings' to line up the P4's mounting holes and this fits on using the same grommet, spring and screw method as the MCX462.