Lian Li B4-mATX 21.3L Small Form Factor PC Case, Support 358mm GPU, 360 AIO, Pre-Installed 2 x 120mm Slim Fans, Black Wood (B4X-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
- This item is covered by Newegg.ca's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2025 and December 31, 2025 you will have until January 31, 2026 to return your product.
Manufacturer Contact Info
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The Lian Li B4X-WD is a 21.3L Micro-ATX PC case with black wood accents, dual horizontal or vertical placement, and room for GPUs up to 358.9mm. It suits compact-build enthusiasts who want a distinctive case without giving up support for a long graphics card.
Recommended For
- Desk-space-conscious gamers building a Micro-ATX PC can use a full-length graphics card without moving to a full-size tower; the case supports GPUs up to 358 mm and can sit vertically or horizontally.
- Builders fitting a PC into a desk layout with limited floor or horizontal space can choose between vertical and horizontal placement; reviewers highlight the orientation choice as a practical feature for different setups.
- Compact gaming-PC builders who want room for substantial CPU cooling can configure a side-mounted radiator, including up to a 360 mm AIO with an SFX power supply; tested reviews report that the case can deliver decent thermal results with a suitable fan setup.
- PC builders who prefer a restrained wood-accented desktop setup can choose the black walnut-front version instead of a conventional mesh-front design.
Real-World Use Scenarios
- For a compact gaming PC with a full-size graphics card, the B4-mATX can fit high-end components without a large tower; testing with an RTX 5080 found good overall thermal performance when the case’s airflow was configured properly.
- When desk space is limited, users can stand the case vertically instead of laying it horizontally; owners report that this frees up desk area, though rear space and display-cable clearance still need checking.
- For a compact build that still uses a standard ATX power supply, the case can avoid the need for an SFX unit; this setup is more restrictive for liquid cooling, so users should plan around a 240mm radiator rather than a 360mm one.
- For a living-room or home-office PC that should look less like a conventional gaming tower, the wood-front version offers a warmer exterior and can be placed horizontally or vertically to suit the furniture and available space.
- For builders assembling a compact mATX system with several large parts, removable panels and brackets make installation more accessible, but the build can still feel tight; checking clearances for the exact GPU, radiator, and power-supply combination helps avoid fit conflicts.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Micro-ATX desktop builds needing horizontal or vertical placement, support for long GPUs, and flexible air or side-radiator cooling |
| Case Design And Finish | Mid-tower case with a black wood finish and 4.0 mm steel and wood construction |
| Motherboard And Expansion | Supports Micro-ATX motherboards and has four expansion slots |
| GPU And CPU Cooler Clearance | Supports GPUs up to 358.9 mm long and CPU coolers up to 166.5 mm tall |
| Cooling And Radiator Support | Two pre-installed 120 mm slim fans at the top; supports a side radiator up to 360 mm. Fan options vary by PSU configuration: side 120/140 mm, bottom 120/140 mm, rear 120 mm, and— with an SFX PSU—front 120 mm |
| Power Supply Compatibility | Supports SFX or ATX power supplies up to 140 mm long, with top or bottom mounting |
| Storage And Dust Protection | One internal 3.5-inch bay, one internal 2.5-inch bay, and a magnetic bottom dust filter |
| Front Panel Connectivity | Two USB-A 3.0 ports, one USB-C 3.2 port, one audio port, and a power button |
| Layout And Cable Management | Can be positioned horizontally or vertically; includes cable-management features and a rotatable AC inlet |
| Model Identifiers | LIAN LI B4 series, model B4X-WD |