3.75 1 5 0

It features a lightweight frame & chassis with three 230mm fans, a dedicated air-duct for graphics card cooling.

Where to buy

Seller Price Seller Rating
Show more

built in fan filters cuts down on a lot of the dust in the case

1 agrees

plenty of good water cooling options available

1 agrees

many large fans built in

1 agrees

removable motherboard tray makes cable routing much easier

1 agrees

spacious interior makes installation of components very easy

1 agrees

fan placement and internal design helps maximize air flow

1 agrees
  • Only 3 words are allowed.

gets heavy right away, hard to carry around

1 agrees

styling is overly conservative and boring looking

1 agrees
  • Only 3 words are allowed.


The Cooler Master ATCS 840 is a heavy-duty ATX/e-ATX/Micro-ATX tower computer case with a classic all-aluminum design that builds on the legacy of the original ATCS design. It features a lightweight frame & chassis with three 230mm fans, a dedicated air-duct for graphics card cooling, and an HDD cooling module for even greater cooling. In addition, the ATCS 840 supports an optional 120mm bottom fan, and two 120mm HDD fans. Most notable about the ATCS 840 is its capacity for dual processors, thereby giving users the opportunity to super-charge their system with maximum computing power. Additional features of the Cooler Master ATCS 840 computer case include a cable management system for better cable routing and neatness, a slide-out motherboard tray along with an easy CPU cooler-remove slot, and a patented finger pressing 5.25” drive to dust filter. The Cooler Master ATCS 840 retails for $299.99 and comes with a 1 year limited warranty.

  • ATX/e-ATX/Micro-ATX
  • All-Aluminum Design
  • Dual Processing
  • Cable Management System
  • Slide-Out Motherboard Tray
  • CPU Cooler-Remove Slot
  • Finger-Pressing Drives
  • 1 Year Limited Warranty
  • Available Color: Black or Silver
  • Materials: Aluminum
  • Dimensions: 9.57” x 22.83” x 24.80”
  • Weight: 13.25kg
  • M/B Type: ATX/e-ATX/Micro-ATX
  • 5.25" Drive Bay: 6 Exposed
  • 3.5" Drive Bay: 6 Hidden, 1 Exposed
  • I/O Panel: USB 2.0 x2, IEEE 1394 x1, MIC x1, eSATA x1, SPK x1
  • Expansion Slots: 7 (PCI)
  • Power Supply: Dual Standard ATX PS2 / EPS 12V (optional)
Cooling System
  • Front : 230 x 30mm standard fan x 1, 700 RPM, 19 dBA (included)
  • Top: 230 x 30mm standard 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)
About Us