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Item#: N82E16811119285

Cooler Master Cosmos SE - Mid Tower Computer Case with High-End Water Cooling Support and Carrying Handles

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  • Polymer, steel, aluminum, mesh front bezel, rubber ATX Mid Tower
  • USB 3.0 x 2, USB 2.0 x 2, Audio In & Out Front Ports
  • 3 External 5.25" Drive Bays
  • 8 Internal 3.5" Drive Bays

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews


Cosmos SE is the successor to Cooler Master's flagship Cosmos II ultra-tower computer case. It delivers the classic racecar look and feel of its predecessor in a smaller, mid tower package. Rails forged of aluminum provide sturdy handles for transporting your system. Although smaller compared to Cosmos II, SE still exhibits high-end features such as expansive support for all-in-one water cooling systems and hard drive storage. With the ability to install up to eight cooling fans or three radiators at once, Cosmos SE is capable of housing extremely powerful cooling components.

Iconic, Racecar-Inspired Design

Superior Water Cooling Support

Cosmos SE continues a lineage of classic design inspired by the supercars of today. Curved aluminum handles, sleek lines, and stylish blue LED accents provide a truly premium aesthetic.

Cosmos SE is capable of supporting up to three radiators at once, including a 120mm in the rear, 240/280mm on top, and a 360mm at the front. Cosmos SE allows you to pack massive cooling power in a perfectly sized enclosure.

Plentiful Storage Space for HDDs/SSDs

Large Cable Management Space

Uniquely designed combo trays can hold two SSDs each, providing support for up to 16 SSDs or eight HDDs in the hard drive cages. Two additional SSD mounting points are located on the backside of the main drive cage, allowing for a total of 18 SSDs.

A nice, clean setup is important for any high-end build. With Cosmos SE, you've got ample space to neatly store any loose cables with approximately 1.3-inch (34mm) of cable management space.

What's Included

Cosmos SE Computer Case

HDD Brackets

Accessory Pack

User Guide

Which Cooler Master Cosmos Computer Case is Right for You?

This Model

Cosmos SE

Cosmos II


ATX Tower

Ultra Tower

Motherboard Support

Up to ATX

Up to XL-ATX


10.4 x 22.4 x 20.6 inches

13.5 x 27.7 x 26.1 inches

Maximum Number of
SSDs Supported



Maximum Number of
HDDs Supported



Fan Support

Top: 120 / 140mm x 2

Front: 120mm x 2 or 140mm x 1

Rear: 120mm x 1

HDD: 120mm x 2

Top: 120mm x 3

140mm x 2

200mm x 1

Front: 120 / 140 / 200mm x 1

Rear: 140mm x 1

Side: 120mm x 2

Middle HDD: 120mm x 1

Bottom HDD: 120mm x 2

Radiator Support

Top: 240 / 280mm x 1

Rear: 120mm x 1

Front: 360mm x 1

Top: 240mm x 1

Bottom: 240mm x 1

Aluminum Carrying Handles

Removable Dust Filters

Learn more about the Cooler Master COS-5000-KWN1

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
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