Description ATCS 840 constitutes a classic all-aluminum design that builds on the legacy of the original ATCS design. The aluminum construction not only allows for a lighter weight but complements the thermal design seamlessly with three 230mm fans, dedicated air duct for graphics card cooling and HDD cooling module for superb cooling. Extra attention has been taken to ensure this elegantly designed chassis is easy to install and maintain, which includes: a slide-out motherboard tray along with an easy CPU cooler-remove slot, tool-free HDD casing and patented finger pressing 5.25" drives to dust filters. Lastly, it gives users the freedom to choose any components they desire, as it supports the latest standards such as E-ATX and dual PSUs. Key Features Independent GPU cooling. High-end graphic cards temperatures can be reduced by 3~5C Ergonomic Design. Dual PSUs System. PSU could be mounted on top or bottom for flexible installation or dual PSU configuration Advanced Cooling System.