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Cooler Master

Cooler Master ATCS 840

The Cooler Master ATCS 840 conforms to the E-ATX form factor and so can accommodate motherboards with form factors ATX, E-ATX and Micro-ATX.

It is made of Aluminium and its dimensions (LxWxH) are 630mm x 243mm x 579mm.

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Cooler Master ATCS 840

help iconForm FactorE-ATXhelp iconFront Fans Speed1700 RPM
help iconMotherboard Form Factors
  • ATX
  • E-ATX
  • Micro-ATX
help iconTop Fans2
help iconMaterialAluminiumhelp iconTop Fans Size230mm
help iconColorBlackhelp iconTop Fans Speed2700 RPM
help iconExpansion Slots7help iconRear Fans1
help icon5.25″ Drive Bays6help iconRear Fans Size100mm
help icon3.5″ Drive Bays6help iconRear Fans Speed1200 RPM
help icon2.5" Drive Bays0help iconCase Fan dBA19 dBA
help iconTool-less Railsyeshelp iconIO Display Panelyes
help iconLength630mmhelp iconFront USB 2.0 Slots4
help iconWidth243mmhelp iconFront USB 3.0 Slots0
help iconHeight579mmhelp iconeSATAyes
help iconFront Fans1help iconAudio IOyes
help iconFront Fans Size230mm

Cooler Master ATCS 840 compatibility review

The Cooler Master ATCS 840 has a the E-ATX form factor. Extended ATX is a slightly deeper version of the ATX standard which is designed to provide all the advantages of ATX but with slightly more room. Using the E-ATX standard, the case can house motherboards and power supplies with form factors ATX, E-ATX and Micro-ATX. The dimensions of the case itself (LxWxH) are 630mm x 243mm x 579mm.

The Cooler Master ATCS 840 has seven expansion slots, so there is plenty of room for extra components, which may be a deciding factor when planning on the longevity and build type of a PC system. The case has six 5.25" drive bays, which is more than enough to house various drives, particularly optical drives. With six 3.5" drive bays there is also plenty of extra HDD space as well. Installing a solid-state drive on this case would require a 3.5" adapter. Installation of hard drives into these drive bays is made all the more easier by screwless rails that allow tool-less mounting.

Made primarily of Aluminium, the Cooler Master ATCS 840 is built to be strong, lightweight, and well-ventilated. This often comes at a price premium, but some see the benefits to be completely worth it. Whatever your case's material, it is important to keep a consistent airflow so that heat doesn't build up inside. It is therefore advised that you make use of the available built-in case fans and fan installation sections.

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