Cooler Master ATCS 840 Case Review

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CM ATCS 840 – Introduction

Cooler Master ATCS 840 Logo From Manual

Computer cases have come a long way since the old beige boxes from a handful of years ago. They come in all shapes, sizes and colors now although their primary purpose remains the same – safely housing your hardware. Cooler Master has been in the business for a while and they are well respected in the area of chassis design. They produce a wide variety of case models that cater to both the enthusiast and casual user as well as a number of related products such as cooler and fans.

Cooler Master ATCS 840 Logo


Cooler Master was founded with the mission of providing the industry’s best thermal solutions. Since its establishment a decade ago, the company has remained faithful to this mission, emerging as a world leader in products and services for companies dealing with devices where heat issues must be resolved.

In pursuing this mission, Cooler Master is absolutely committed to delivering solutions that precisely meet customer requirements for features, performance, and quality. Moreover, we strive to be a reliable long-term partner for our customers that they can truly depend on. It aims to be the first and foremost name that comes to mind for companies around the world seeking thermal solutions, and seeks to build such a reputation through outstanding technology, sophisticated design, and superior service.

Cooler Master’s current business encompasses a comprehensive lineup of thermal solutions for a full range of applications. Its products range from heat sinks and fans to component housing, chassis, and ducting for computers, industrial machinery, telecommunications equipment, and many other devices.

A critical component of Cooler Master’s ability to successfully pursue its mission is an unstinting commitment to quality, as demonstrated by the ISO 9001 certification granted to its main manufacturing plant in Taiwan. It has also enforced ISO guidelines and is in the process of applying for ISO 9002 certification at its second and third plants, located in China. Cooler Master has also implemented a number of analytical and testing protocols to ensure top quality, including at subcontractors, to further ensure thorough quality control. Moreover, Cooler Master’s dedication to quality extends beyond manufacturing to every aspect of its operation, including service.


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.

  -Front fan: 230×30 mm x 1

  -Top fan: 230x30mm x 2

  -Rear fan : 120 x 25 mm x 1

  -Bottom fan :120mm (optional)

  -Air duct with 120mm fan

  -HDD fan: 120mm x 2 (optional)

  -Support high end CPU cooler (the cooler should be lower than 200mm)

  -Support the radiator with three 120mm fans

Ergonomic Design

Slide-out M/B tray

Easy CPU cooler changing

Top I/O panel

Tool free 5.25” system

Tool free HDD system

Washable air filter

Cable Management system for better cable routing and neatness

Cooler Master ATCS 840 Exploded View From Manual


Available Color Black / Silver

Dimension (W / H / D) (W) 243 x (H) 580 x (D) 630 mm

(W) 9.57 x (H) 22.83 x (D) 24.80 inch

Weight Net Weight: 13.25 kg (29.21 lb);

Gross Weight: 15.75 (34.72 lb)

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 30mm standard fan x 1, 700 RPM, 19 dBA (included)

  -Top: 230 x 30mm std fan x 2,700 RPM, 19 dBA (included) (can be swapped for three 120mm fans)

  -Rear: 120 x 25mm standard fan x 1, 1200 RPM, 17 dBA (included)

  -Bottom: 120mm (optional)

  -HDD Module: 120mm fan x 2 (optional)

  -External Air Duct: 120mm fan x 1 (optional)

Expansion Slots 7

Power Supply Dual Standard ATX PS2 / EPS 12V (optional)

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