Cooler Master S400 Silencio Steel Quiet Micro ATX PC Gaming Case

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Silencio S400 Steel Edition Gaming Case from Cooler Master

silencio s400 mini-tower case


Enjoy a silent case that offers both quiet operation and exceptional thermal performance with the Silencio S400 from Cooler Master. Sound dampening material surrounds the sides of your system, with two included 120mm PWM fans with rubber padding to reduce noise. The removable cover on the top panel and the steel side panel both work to reduce noise from your system. For more demanding systems, the top panel's sound dampening cover can be removed to increase ventilation. Paired with the front panel's ventilation, you can provide your PC with fantastic airflow without sacrificing the silence. The Silencio S400 offers a versatile HDD cage, GPU support up to 319mm, an SD Card reader and incredible sound resistant materials in a smaller form to give you a frame to install your high-end components easier and quieter than ever before.

Experience a New Level of Silent PC Performance

sound dampening side panel


The steel side panel on the side of the Silencio S400 uses sound dampening material to drastically reduce the amount of noise coming from the inside of your system. This unique material is perfect for optimal noise reduction, and allows you to work and play without the distraction of PC noise.

Even with Cooling Fans Your System is Whisper-Quiet

rubber padded 120mm fans


Two Silencio FP 120mm PWM fans have been pre-installed into the Silencio S400 to provide optimal cooling to the interior of your PC. The fans use special rubber padding to reduce the noise they create, and you can also connect additional fans with the 4-pin 1-to-3 splitter that is included with the case.

Access the Interior of your System with Ease

reversible front door


The front door of the Silencio S400 also uses sound dampened steel to keep noise contained inside. It uses an innovative reversible mounting system that allows the door to be opened in two directions to make access easier and more convenient.

Change Up the Interior to Fit your Dream Components

HDD cage clearance


The HDD cage inside the Silencio S400 can be moved to the front for more PSU clearance, backwards for more front radiator space, or completely removed if you don't need to use HDD storage to create more room for other components.

Additional Connectivity Options to Enhance your System

sd card reader audio port


The I/O panel on the top of the Silencio S400 houses an SD Card reader to provide data transfer from your devices. It also offers a single 4-pole headset jack that offers both mic and audio capabilities so you don't need separate jacks.

Get the Latest Tech in this Compact Case

gpu length


The S400 provides space for graphics cards up to 319mm. This generous clearance space allows you to install the latest graphics cards to give you incredible visuals.

Enhance your Airflow or Keep Quiet

removable cover


The Silencio S400's top cover can be removed to provide optimized airflow and better ventilation to your system, or it can be kept in place to keep the noise reduced even further. Remove or keep it in place depending on the performance you need.

Core Chassis Specifications
Case Edition Silencio S400
Case Form Factor MicroATX
Motherboard Form Factor
  • MicroATX
  • Mini-ITX
I/O, Bays & Expansion
Front/Side/Top Panel I/O
  • 1 x Headphone/Mic Combo
  • 1 x Power Button
  • 1 x Reset Button
  • 1 x SD/MMC Card Reader
  • 2 x USB 3.2 Gen1 Type-A
Drive Bays
  • 4 x 2.5"/ 3.5" Internal
  • 1 x 5.25" External
Standard Expansion Slots 4
Vertical Expansion Slots  
Fans & Filters
Fan Bays
  • 1 x 120mm
  • 4 x 120mm / 4x 140mm
Fans Included 2 x 120mm
Fan Controller/Hub  
Dust Filters
  • Bottom
  • Front
  • Top
Liquid Cooling Support
Front Radiator Compatibility 1 x 120/140/240/280mm
Top Radiator Compatibility 1 x 120/240mm
Bottom Radiator Compatibility  
Rear Radiator Compatibility 1 x 120mm
Side Radiator Compatibility  
Max CPU Cooler Height 167 mm
Max GPU Card Length 319 mm
Cable Routing Space 20mm Behind Motherboard Tray mm
Side Panels
Window/s No
Window Configuration  
Window Construction  
LED Lighting Functionality
LED Lighting No
LED Lighting Emitters  
LED Lighting Colour  
LED Lighting Support & Control  
Power Supply Compatibility
PSU Included No
PSU Wattage (If Included)  
PSU 80+ Rating (If Included)  
PSU Support ATX
PSU Mounting Location Bottom Mount, Rear
Max PSU Length 140/325 mm
Chassis Physical Specifications
Colour Black
Chassis Contruction Materials Steel / Plastic
Dimensions 210 x 408 x 418 (WxHxD mm)
Weight 7.3 kg (Approx)
Please Note 280mm Front & 240mm Top Rad, may require ODD removal. ODD removal required for 2x Top Fans.