One of the most important items in cooling solution of basic components in any configuration is, in most cases undeservedly underestimated, the chassis. From simple "boxes" that hold all components together chassis have evolved into products that get a lot of attention. Cooler Master's model ATCS 840 that we are going to present you is anything but simple, ordinary chassis. ATCS (Active Thermal Convention System) series of cases is not new in Cooler Master's product portfolio. In 1999, Cooler Master was one of the first manufacturers that launched chassis made completely of aluminum.