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Coolermaster MCS-S400-KN5N-S00 (w/  Steel Side Panel) Silencio S400 Case



  • Silencio Design
  • Silencio Technology
  • Sound Dampening Material
  • Seamless Tempered Glass or Sound-Dampened Steel
  • Top & Front Ventilation
  • Reversible Steel Door


The Silencio's minimalistic design cloaks its complexity. Design elements fine-tuned in form and function result in minimized noise and efficiently maintained system temperatures


Behind the outer panels are pieces of meticulously placed sound dampening material. The development of the Silencio was driven by Sorama's Cam64-this allowed for the entire sound spectrum to be visually analyzed by source, resonance pattern, and frequency.

With the identification of peaks within certain frequency ranges, fine-tuning the Silencio for the dispersion of resonance was made possible, reducing the prominence of noise generated by system components. Every detail in design optimized the Silencio for thermal efficiency and silence, from the type of material used to its placement.


The Silencio utilizes a combination of sound dampening materials, from thick soft foam to heavy mass-loaded vinyl, to precisely counter prominent frequencies.


Available with seamless tempered glass or a sound-dampened steel side panel, systems can be built for show or for stealth with the Silencio.



For an even higher demand for ventilation, the top panel's Sound Dampening Cover can be removed for unrestricted ventilation. An optional dust filter for the top panel ventilation is included, allowing the top panel and front panel work in conjunction to cool the system.


The front panel features a recurved vent, directing air in through the front bezel. The curve points downward, taking air in from the bottom, and straightens out to direct air in from either side of the steel front door.


The steel front door features a reversible mounting system, capable of opening in either direction. To prevent vibrations, a softer, thicker material spans the steel structure in conjunction with a hinge system of magnets and rubber stompers.


Two Silencio FP 120mm PWM fans are pre-installed with rubber padding to reduce noise, featuring specially designed blades that allow both quiet operation and high air pressure.


The HDD cage is (re)movable. The cage can be shifted forward to make room for a longer PSU, backwards for additional radiator space, or completely removed if HDD storage is not needed.


Mini-ITX, Micro-ATX


5.25" ODD x 1 (ODD version)
3.5" HDD x 4
2.5" SSD x 4


  • CPU Cooler (Steel): 167mm
  • CPU Cooler (TG): 166mm
  • Power Supply: 325mm (w/o front radiator & HDD cage)
  • 140mm (HDD cage in backmost position)
  • Graphics Card: 319mm


Product Name

Silencio S400 (w/ Steel Side Panel)

Product Number

MCS-S400-KN5N-S00 (w/ Steel Side Panel)

Exterior Color


Materials - Body

Steel, Plastic, Sound Absorbing Material

Materials - Left Side Panel

Sound-Dampened Steel (MCS-S400-KN5N-S00)

Dimensions (LxWxH) - incl. Protrusions

418 x 210 x 408mm

Dimensions (LxWxH) - excl. Protrusions

403.5 x 210 x 400mm

Volume (Liters, excl. Protrusions)


Motherboard Support

Mini-ITX, Micro-ATX

Expansion Slots


Drive Bays - 5.25"


Drive Bays - 3.5" HDD


Drive Bays - 2.5" SSD


I/O Panel - USB Ports

USB 3.2 Gen1 x 2 (formerly USB 3.0)

I/O Panel - Audio In / Out

1 x 3.5mm Headset Jack (Audio + Mic)

I/O Panel - SD Card Reader

Supports SD & MMC Cards

Pre-installed Fan(s) - Front

120mm x 1(PWM 800~1400 RPM)

Pre-installed Fan(s) - Rear

120mm x 1(PWM 800~1400 RPM)

Fan Support - Front

120mm x 2 / 140mm x 2

Fan Support - Top

120mm x 1 / 140mm x 1

120mm x 2 / 140mm x 2 (remove ODD cage)

Fan Support - Rear

120mm x 1

Radiator Support - Front

120 / 140 / 240 / 280mm(remove & reinstall ODD bracket to mount 280mm radiator, may interfere with HDD mounted below ODD bracket)

Radiator Support - Top

120mm, 240mm*

*240mm requires removal of ODD cage

Radiator Support - Rear


Clearances - CPU Cooler

167mm (MCS-S400-KN5N-S00)

Clearances - Power Supply

325mm (w/o front radiator & HDD cage)

140mm (HDD cage in backmost position)

Clearances - Graphics Card


Cable Routing - Behind MB Tray


Dust Filters

Top, Front, Bottom

Power Supply Support

Bottom Mount, ATX PS2

No additional files, specification sheets, guides or documentation found for product.

Warranty: 12 Month Return To Base

Full manufacturers warranty details are available at the manufacturers (CoolerMaster) web site.

Unless otherwise specified Techbuy is normally your first point of contact for warranty related returns, further information regarding our warranty policies and consumer guarantees is available on our policies and service & support pages.

To apply for return of a product just go to our returns page.

These terms are in addition to and do not affect any terms, conditions, guarantees and warranties implied by law.

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