The Cooler Master ATCS 840 is huge; it's even bigger than the SilverStone Temjin TJ10! The case measures in at 243 x 580 x 630mm and its gross weight is 15.75 kilograms. There is enough room within the ATCS 840 to mount dual ATX power supplies and an Extended ATX motherboard. On the front of this case are six external 5.25" drive bays (with one of them being convertible to an external 3.5" bay) to provide plenty of room for multiple optical drivers and any other peripherals. Below the 5.25" bays is a 230mm intake fan hidden behind a piece of aluminum and the Cooler Master logo on the front. Pleasing us is a dust filter in front of this intake fan. At the top of the case is the power and reset switches along with the LED indicators and front panel I/O ports. The front I/O ports on the ATCS 840 include four USB 2.0, audio input and output, one IEEE-1394 Firewire, and one eSATA. Around the entire case is a brushed metal finish that gives off a very nice look.
Both side panels for this case are flat aluminum sheets with no side intake fans or acrylic windows. Behind the front I/O ports on the top of the case are dual 230mm exhaust fans.