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Product Code: SRHO-084
MPN #: MCS-S400-KN5N-S00
Build a quiet and efficient system with the Cooler Master Silencio S400 Midi Tower Case, supporting micro ATX and Mini-ITX motherboards. Crafted from plastic and steel, it features noise-dampening design, spacious interior, and optimized airflow—ideal for gaming, professional workstations, and custom PC builds.
The Silencio S400 The Silencio is a silent case that makes no compromises in thermal performance. Sound dampening material surrounds the system build, rubber padding cushions all included fans, and a removable cover shields noise that escapes from the top panel. The Silencio S400 is available with either a tempered glass or a sound-dampened steel side panel. For demanding systems, the top panel’s Sound Dampening Cover can be removed for increased ventilation. Paired with the front panel’s ventilation, directionally taking in air through the mesh, silence can be accomplished without sacrifice. The subtle ventilation takes in air from three sides of the sound-dampened front door, with the mesh filter aimed toward the bottom for an efficient intake of air. Sound Dampening Material – Sound dampening material minimizes noise from the pre-installed fans, the power supply, all steel panels, the steel front door, and all storage mounting points for 2.5” and 3.5” drives. Tempered Glass or Sound-Dampened Steel – The Silencio S400 is available in two versions. Seamless tempered glass to show the system build or sound-dampened steel for optimal noise reduction. Removable Sound Dampening Cover – The top cover can be removed for increased ventilation or kept in place to reduce noise. Reversible, Steel Front Door – The sound-dampened, steel front door features a reversible mounting system that is capable of opening in two directions. Versatile HDD Cage – The HDD cage can be shifted to the front for more PSU clearance, backwards for additional front radiator space, or completely removed if HDD storage is not required. SD Card Reader – The I/O Panel features an SD Card Reader for rich connectivity. Headset Jack – The single 4 pole headset jack features both audio and microphone capabilities simultaneously so that separate jacks are not needed. Silencio Fans – Two Silencio FP 120mm PWM fans are pre-installed with rubber padding to reduce noise. To connect additional fans, one 4pin 1-to-3 splitter is included.
| Design | |
| Maximum PSU length | 32.5 cm |
| Maximum graphics card length | 31.9 cm |
| Maximum CPU cooler height | 16.7 cm |
| On/off button | Y |
| Reset button | Y |
| Cable management | Y |
| Anti-dust filter | Y |
| Side window | N |
| Number of expansion slots | 4 |
| Number of 2.5" bays | 4 |
| Number of 3.5" bays | 4 |
| Number of 5.25" bays | 1 |
| Supported motherboard form factors | micro ATX, Mini-ITX |
| Product colour | Black |
| Material | Plastic, Steel |
| Type | PC |
| Form factor | Midi Tower |
| Power supply | |
| Supported power supply form factors | ATX, PS2 |
| Power supply location | Bottom |
| Power supply included | N |
| Ports & interfaces | |
| Audio output | Y |
| Audio input | Y |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| Cooling | |
| Top radiator sizes supported | 120,240 mm |
| Rear radiator sizes supported | 120 mm |
| Front radiator sizes supported | 120,140,240 mm |
| Liquid cooling capability | Y |
| Fan speed | 800 - 1400 RPM |
| Top fans diameters supported | 120,140 mm |
| Number of top fans supported (max) | 2 |
| Rear fans diameters supported | 120 mm |
| Number of rear fans supported (max) | 1 |
| Rear fans installed | 1x 120 mm |
| Front fans diameters supported | 120,140 mm |
| Number of front fans supported (max) | 2 |
| Front fans installed | 1x 120 mm |
| Storage | |
| Card reader integrated | Y |
| Compatible memory cards | MMC, SD |
| Supported HDD sizes | 2.5,3.5,5.25" |
| Weight & dimensions | |
| Weight | 7.03 kg |
| Height | 408 mm |
| Depth | 418 mm |
| Width | 210 mm |
| Packaging data | |
| Package weight | 8.06 kg |
| Package height | 480 mm |
| Package depth | 480 mm |
| Package width | 278 mm |
| Other features | |
| Volume | 33.9 L |
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We are retiring PICOPC Products MNHO-073, MNHO-048 and MNHO-043 and they have reached EOL (End Of Life) as we are introducing new products with better technology. We would recommend you to look into MNHO-095. For Untangle, pfSense, OPNsense, Windows 11, Proxmox VE etc. we recommend MNHO-095 whereas for Sophos, Kerio Control and Endian, we would recommend MNHO-069. (A complete list of supported OS can be found in each product's listing)