Korean cooling specialist Zalman introduced the ZM-RHS90 heatsink specially designed for ATI Radeon HD 4890, and HD 4870 reference-design PCB. The heatsink is made of anodized aluminum. It measures 93.4 x 36.5 x 23 mm (LxWxH), and weighs 55 g. Due to the large number of Radeon HD 4890/HD 4870 graphics cards in the market using the reference AMD PCB design, Zalman expects a good compatibility range. The heatsink is mounted behind the VDDC chokes, and covers the most significant set of MOSFETs on the card. It uses push-pin retention mechanism. The use of this heatsink is recommended by Zalman, when users opt for their compatible GPU heatsinks that don't cover the card's VRM area. It will arrive at stores very soon.