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.
Minimal Design,Multiple Styles
The B4-mATX offers a clean mesh panel for an airflow-focused look or a real wood panel for a warmer, refined setup. Both support front-to-back airflow, balancing cooling performance with a streamlined exterior.
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.
REVERSIBLE Rear Fan Bracket
The rear fan bracket features a reversible design for greater layout flexibility. It can be installed outward to create more clearance for liquid cooling, or inward to position the fan closer to the CPU airflow path and improve CPU air-cooling performance by up to 1°C.
Specifications:
| Product Name | A4-H2O |
| Model No. | A4H2OX5 |
| Color | Anodized Black Exterior / Matte Black Interior |
| Riser Cable Generation | PCIe 5.0 |
| Dimensions | 326 × 140 × 244 mm |
| Capacity | 11L |
| Materials | Aluminum Exterior / SPCC Steel Interior |
| Motherboard Support | Mini-ITX |
| Fan Support | Top: 2 × 120mm |
| Radiator Support | Top: 240mm (55mm max total thickness with fans) |
| PSU Support | SFX / SFX-L |
| GPU Length Clearance | Max 322mm |
| CPU Cooler Clearance | Max 55mm |
| Drive Support | 1 × 2.5″ SSD |
| Expansion Slots | 3 |
| I/O Ports | 1 × USB 3.0 Type-A, 1 × USB 3.1 Type-C, 1 × Mic, 1 × HD Audio |
| Warranty | 1 Year |
