Cooler Master ATCS 840 Black Aluminium ATX Full Tower Lifestyle Cabinets (RC-840-KKN1-GP)

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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 to make sure this elegantly design chassis is easy to install and maintain, which includes: slide-out motherboard tray along with easy CPU cooler-remove slot, tool-free HDD casing, patented finger pressing 5.25" drive to dust filter.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.


  • Independent GPU cooling
  • High-end graphic cards temperatures can be reduced by 3~5oC
  • Ergonomic Design
  • Dual PSUs System.
  • PSU could be mounted on top or bottom for flexible installation or dual PSU configuration
  • Advanced Cooling System.
  • Support high end CPU cooler (the cooler should be lower than 200mm)
  • Support the radiator with three 120mm fans
  • Ergonomic Design
  • Cable Management system for better cable routing and neatness

Technical Details

  • Brand : Cooler Master
  • Model : RC-840-KKN1-GP
  • Material : Aluminum
  • Motherboards : Micro-ATX / ATX / E-ATX
  • 5.25" Drive Bay : 6 Exposed (without the use of exposed 3.5" drive bay) 
  • 3.5" Drive Bay : 6 Hidden 1 Exposed (converted from one 5.25" drive bay)
  • I/O Panel : USB x 4,IEEE 1394a x 1,eSATA x 1,Mic x 1,Audio x 1
  • Cooling System : Front : 230 x 30 mm fan x 1 / 700 RPM / 19 dBA,Top: 230 x 30 mm fan x 2 /700 RPM / 19 dBA(can be swapped for three 120 mm fans)Rear : 120 x 25 mm fan x 1 / 1200 RPM, 17 dBA,Bottom: 120 x 25 mm (optional)
  • HDD Module : 120 mm fan x 2 (optional)
  • External Air Duct : 120 mm fan x 1 (optional)
  • Expansion Slots : 7
  • Power Supply : Dual Standard ATX PS2 / EPS 12V (optional)
  • Dimensions : 243 x 580 x 630 mm
  • Weight : 13.25 kg / 29.21 lb



Brand  Cooler Master
Series  R Series
Model  RC-840-KKN1-GP
Type  ATX Full Tower
Color  Black
Case Material  Aluminum
With Power Supply  No
Motherboard Compatibility  Extended ATX, ATX, Micro ATX
With Side Panel Window  No
External 5.25" Drive Bays  6
External 3.5" Drive Bays  1
Internal 3.5" Drive Bays  6
Expansion Slots  7
Front Ports
Front Ports  USB / Audio / IEEE 1394 / e-SATA
Cooling System
120mm Fans  1 x 120mm rear fan
Physical Spec
Dimensions  24.80" x 9.57" x 22.83"


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Sunday: Holiday

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