The XP-120 differs from its predecessors in that the large fins are made of aluminum instead of copper. They are soldered onto a nickel-plated solid copper base. The large, hybrid copper/aluminum XP-120 comes in at a light 370 grams compared to the 590 gram weight of the all-copper SP-94. The low weight allows the standard plastic Intel retention mechanism to be used. The heavier all-copper heatsinks use bolt-through mounting, necessitating the removal of the motherboard from the case for installation.