Compact 21.3L mATX case with broad compatibility.
Supports M-ATX / Mini-ITX, 358mm 4-slot GPUs, and 140mm ATX PSUs.
Supports up to 360mm radiators with SFX PSU, or 240mm with ATX PSU.
Up to 168mm CPU cooler clearance, or 162mm with side fan bracket.
Includes 2 pre-installed 120 × 120 × 15mm slim top fans.
Supports up to 9 fans across top, side, bottom, rear, and front.
Removable top bracket simplifies CPU 8-pin routing and fan setup.
Removable front bracket allows easier large GPU installation.
Supports both horizontal and vertical layouts.
Build like never B4
Co-developed with DAN Cases, the B4-mATX’s modular design unlocks versatile build possibilities. With multiple color, panel, and layout options, plus an optional accessory, it adapts to a wide range of styles.
Compact Design, Broad Compatibility
With a compact 21.3L volume, the B4-mATX delivers impressive hardware compatibility, supporting M-ATX motherboards, 360mm AIOs, 140mm ATX PSUs, and up to 358mm 4-slot GPUs.
Vertical Mode,Maximized Desk Space
The vertical layout improves desk space efficiency by up to 30%. Integrated rear feet allow quick and easy switching between different usage modes.
Note: In vertical mode, the rear clearance for the connector and cable routing is 52mm in total. Please ensure your HDMI / DP cable fits within this space.
Recommended Liquid Cooling Configuration
The B4-mATX supports 360mm and 280mm radiators with up to 52mm total thickness.
Note: Due to internal space limitations, fans must be installed outwards when using liquid cooling.
ACCESSIBLE CONNECTIVITY
The I/O layout keeps essential ports easy to reach in both traditional and vertical layouts, with a high-speed USB Type-C port supporting up to 20Gbps transfer speeds.
SPECIFICATIONS
PRODUCT NAME B4-mATX Mesh B4-mATX Wood
MODEL NO. B4X/B4W B4X-WD/B4W-WD
COLOR Black / White Black / White
DIMENSIONS (DxWxH) 420 x 191 x 288mm 420 x 191 x 288mm
MATERIAL Steel 4.0mm Steel 4.0mm Wood (Walnut / Beech)
MOTHERBOARD Micro-ATX, Mini ITX
STORAGE Front: 2.5” SSD x 1
Bottom: 3.5” HDD x 1 or 2.5” SSD x 1
GPU LENGTH CLEARANCE 358mm
CPU COOLER
HEIGHT CLEARANCE 162mm (168mm without side fan bracket)
PSU SUPPORT ATX (Up to 140mm) / SFX
RADIATOR SUPPORT Side (With SFX PSU) 360mm / 280mm /240mm
Side (With ATX PSU): 240mm
FAN SUPPORT
Top: 120mm x 2 (Pre-installed)
Side (With SFX PSU) 120mm x 3 / 140mm x 2
Side (With ATX PSU): 120mm x 2
Front (With SFX PSU ONLY): 120mm slim fan x 1
Bottom: 120 mm x 3 / 140mm x 2
Rear: 120 mm x 1
INCLUDED FANS Top: 120x120x15mm (x2)
DUST FILTER Bottom: Magnetic Filter x 1
I/O PORTS
USB 3.0 Type A x 2
Power Button x 1
Audio x 1
USB 3.2 Type C x 1
WARRANTY 1-Year