A memory module assembly (100) includes a memory card (200) having a right side surface (240) and a left side surface (220), a heat sink (400) and a heat pipe (500). The heat sink includes a base member (420) attached to the left side surface of the memory card and a shell (440) attached to the right side surface of the memory card and coupled to the base member. The base member includes a substrate portion (422) attached to the left side surface of the memory card and a support portion (424) extended from the substrate portion and supported on a top edge of the memory card. The heat pipe includes an evaporator (520) in thermal engagement with one of the shell and the substrate portion and a condenser (540) in thermal engagement with the support portion.