A VGA card assembly comprises a VGA card (10) having a socket (13) thereon. A GPU (11) is attached on the socket. A base plate (22) is located on the VGA card and contacts with the GPU, for dissipating heat generated by the GPU. A back plate (30) is located below the VGA card, for supporting the VGA card. The back plate has studs extend upwardly through the VGA card. Fasteners extend downwardly through the socket to threadedly engage with the studs. Screws extend downwardly through the base plate to threadedly engage with the fasteners. A heat dissipation device including a fan, a heat pipe, fins and a lid is removably mounted on the base plate.