A folded heatsink for cooling heat-producing devices. The folded heatsink includes a substantially planar base having a first end and a second end. The base is intended to be affixed in thermal contact to an exposed, substantially planar surface of one or more heat-producing devices. The folded heatsink also includes two shoulders each having a proximal end and a distal end. The proximal ends of the shoulders project substantially at right angles from the first and second ends of the base. The folded heatsink also includes two arms each having a proximal end and a distal end. The proximal ends of the arms project substantially at right angles from the distal ends of the shoulders such that the base, shoulders and arms from a nearly closed rectangular tube formed from a continuous sheet of metal.