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Cooler Master MasterFrame 400 mATX Modular PC Case - Micro-ATX/Mini-ITX, Aluminum Open Frame Chassis, 1 x ARGB Fan Preinstalled, 390mm GPU, 360mm Radiator Support, Black
- Flexible Layouts
- Switch between vertical, horizontal, or inverted layouts to fit your desk, workflow, and style.
- Build Your Way
- The aluminum open-frame design delivers structural rigidity, clean airflow, and a bold, functional aesthetic.
- Compact Yet Powerful
- Fits Mini-ITX and Micro-ATX builds with space for up to nine fans,
- a top-mounted 360 mm radiator, and 390 mm GPUs with anti-sag support for cool, stable performance.
- Quick Access, Zero Hassle
- Magnetic tool-free mesh panels provide quick access for upgrades, maintenance, and cable management, streamlines your build.
- Future-Ready Connections
- Front I/O includes USB 3.2 Gen 2x2 Type-C, dual USB 3.2 Gen 1 Type-A, and combo audio, giving you the speed and convenience modern setups demand.
- Modern Front I/O
- Equipped with USB 3.2 Gen 2 Type-C, dual USB 3.2 Gen 1 Type-A ports, and a combo audio jack for fast connectivity and charging.
- Tool-Free Panel Removal
- Easily remove side panels without tools for quick access and modifications during build or upgrades.
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Learn more about the Cooler Master MF400M-KHNN-S00
| Brand | Cooler Master |
|---|---|
| Series | Master Frame Series |
| Model | MF400M-KHNN-S00 |
| Color | Black |
|---|---|
| Case Material | AL + SGCC + TG / Mesh |
| Motherboard Compatibility | Micro ATX / Mini ITX |
| Dust Filters | Front / Side |
| Internal 3.5" Drive Bays | 1 |
|---|---|
| Internal 2.5" Drive Bays | 1 |
| Front Ports | 2 x USB 3.2 Gen 1 Type A / 1 x USB 3.2 Gen 2 x 2 Type C 1x 3.5MIc/ Audio Combo Jack |
|---|
| Fan Options | Front: 2 x120mm / 1 x 140mm, 1 x 180mm, 1 x 200mm(Conditional Support) Top: 3 x120mm / 2 x 140mm / 2 x 180mm, 2 x 200mm (Fan thickness = 25.5mm) Rear: 1x 120 mm Bottom: 3x 120mm, 2x 140mm, 2x 180mm, 2x 200mm, and all fans up to 30mm thick. |
|---|---|
| Pre-installed Fans | Rear: 1x Sickle Flow 120 mm ARGB Black / 1x Sickle Flow 120 mm ARGB White |
| Radiator Options | Rear - Up to 120mm / Top - Up to 240mm / Top - Up to 280mm / Top - Up to 360mm |
| Max GPU Length | 390 mm |
|---|---|
| Max CPU Cooler Height | 190 mm |
| Max PSU Length | 160 mm |
| Dimensions | 471 x 261 x 373.8 mm |
| Weight | 8kg |
| First Listed on Newegg | April 16, 2026 |
|---|
Warranty & Returns
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 Newegg.com's 30-Day Return Policy.
- Read full return policy for details.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-888-624-5099
- Support Email: [email protected]
- Support Website
- View other products from Cooler Master
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