Lian Li B4-mATX 21.3L Small Form Factor PC Case, Support 358mm GPU, 360 AIO, Pre-Installed 2 x 120mm Slim Fans, White Wood (B4W-WD)
- Strong Hardware Compatibility: Supports mATX motherboards, GPUs up to 358mm, and CPU coolers up to 168mm tall.
- Dual Positioning: Use horizontally for a desktop blend or vertically for a space-saving tower design.
- Pre-installed Fans: Comes with two slim 120mm non-RGB fans
- Elegant Aesthetic: Available in black walnut or white beech wood finishes for a stylish look.
- Easy Cable Management: Rotatable AC inlet and ample rear clearance for tidy cable organization in both orientations.
- Supports up to a 360mm AIO with SFX PSU and accommodates ATX PSU (max 140mm) for flexible fan and radiator options.
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Overview
Specs
Reviews (1)
The B4 mATX is a 21.3 -liter small form factor case developed in collaboration with DAN Cases. Designed to deliver strong hardware compatibility in a compact footprint, it supports mATX motherboards, up to 358mm GPUs, and both ATX and SFX power supplies. The B4 mATX can be positioned either horizontally or vertically, allowing users to adapt the system style to their workspace. Multiple front panel options are available, including mesh or real wood finishes, giving the B4 mATX a versatile aesthetic suited for both gaming and lifestyle. With thoughtful airflow design, modular mounting brackets, and flexible cooling configurations, including support for up to a 360mm AIO when using an SFX PSU, the B4 mATX delivers the performance potential of larger cases within a compact SFF design
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 until: January 31, 2026
- Return for replacement until: January 31, 2026
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The LIAN LI B4-mATX B4W-WD is a 21.3-liter white wood-accented Micro-ATX PC case for compact gaming or workstation builds that need room for a graphics card up to 358 mm and flexible cooling, including a side radiator up to 360 mm with an SFX power supply.
Recommended For
- mATX gaming PC builders who want to reduce desk footprint without giving up support for a long, large graphics card; the case supports GPUs up to 358 mm, though component fit depends on the full build.
- Desk setups that need a case to fit horizontally or vertically, or that favor a white wood-front look; the B4-mATX supports both orientations and is offered with wood-panel finishes.
- Compact-build enthusiasts planning a high-heat CPU setup around a side-mounted 360 mm radiator and an SFX power supply; that combination is supported, but requires checking radiator thickness and other component clearances.
- Builders who already own a short ATX power supply and want a compact mATX case; ATX units up to 140 mm are supported, with less room for some cooling configurations than an SFX-powered build.
Real-World Use Scenarios
- Building a compact mATX gaming PC with a full-size graphics card: the B4 can fit long, thick GPUs while keeping the system smaller than a typical mid-tower, though component clearances should be checked together before buying.
- Fitting a desktop PC into a crowded workspace: stand the case vertically to reduce the space it takes up on the desk, or lay it horizontally to suit a shelf or desktop layout. Check rear cable clearance if using it vertically.
- Building a compact system for demanding gaming or other sustained workloads: tested configurations show the case can handle high-performance hardware when its cooling is configured carefully; the included top fans matter to airflow.
- Creating a PC that fits a room or desk with a warm, understated look: the white wood-front version pairs a compact computer build with a beech finish, making it an option for setups where a mesh-front gaming-case appearance is not preferred.
- Building with a preferred cooling setup: use air cooling or choose a compatible side-mounted liquid cooler, with support for a larger radiator depending on the power-supply choice. Expect to plan the parts and cable routing carefully in the compact interior.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Micro-ATX desktop builds that need flexible horizontal or vertical placement, support for long graphics cards, and configurable air or liquid cooling |
| Case Type And Compatibility | Mid-tower case for Micro-ATX motherboards |
| Cooling Configuration | Includes two pre-installed 120 mm slim fans; supports additional fans at the top, side, front, bottom, and rear, with fan options varying by power-supply type; side radiators up to 360 mm |
| Component And Power Supply Fit | Fits graphics cards up to 358.9 mm and CPU coolers up to 166.5 mm; supports ATX power supplies up to 140 mm or SFX, with top or bottom mounting |
| Storage And Expansion | One internal 3.5-inch bay, one internal 2.5-inch bay, and four expansion slots |
| Front Ports And Controls | Two USB-A 3.0 ports, one USB-C 3.2 port, one audio port, and a power button |
| Appearance And Construction | White wood finish with a 4.0 mm steel and wood enclosure |
| Dust Filtration And Cable Management | One magnetic bottom dust filter; supports cable management |
| Layout And Dimensions | Supports horizontal or vertical layouts; measures 47.6 × 26.6 × 36.3 cm |
| Model Identifiers | LIAN LI B4 series, model B4W-WD |