Lian Li

Lian Li B4-mATX 21.3L PC Case

Status: Lian Li B4-mATX 21.3L PC Case: Unavailable on Amazon as of 2026-10-19 16:21 UTC. SpecPicks has no in-stock listing with matching specs on file; the search below lists current offers. eBay sellers may still list this model new or used.

🛒 Search eBay for this model

Bottom line: The Lian Li B4-mATX 21.3L PC Case is an ATX case with a mesh front panel and 2 fans pre-installed; it fits graphics cards up to 358mm long and a 360mm radiator (manufacturer spec).

Unavailable on Amazon as of 2026-10-19 16:21 UTC

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives:

Similar: Okinos 314 ARGB — $54.99 on Amazon as of 2026-10-21 10:17 UTC (price may vary).

View Current Price — $54.99

Similar: DARKROCK EC2 Black ATX Mid Tower PC Case — $49.99 on Amazon as of 2026-10-21 20:20 UTC (price may vary).

View Current Price — $49.99

Similar: GAMDIAS ATX Mid Tower Gaming Computer PC Case… — $59.99 on Amazon as of 2026-10-21 20:20 UTC (price may vary).

View Current Price — $59.99

Original listing (currently unavailable) → Compare to similar pc cases

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-19

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. About the author →

Pros & Cons

Pros

✓ 2 fans pre-installed
✓ Fits graphics cards up to 358mm long and a 360mm radiator (manufacturer spec)
✓ Mesh front panel for intake airflow

Cons

✗ 358mm GPU clearance rules out some of the longest triple-fan cards, a few of which run past 350mm; check your card's length
✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

SpecPicks Verdict

SpecPicks scored Lian Li B4-mATX 21.3L PC Case using a rating × review-volume × price-fit model applied to published specs and reviews across the pc cases category. Lian Li's pc cases lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for pc cases of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

Compact Design: 21.3-liter small form factor case designed for mATX motherboards and GPUs up to 358mm.
Versatile Orientation: Can be positioned horizontally or vertically, adapting to your workspace style.
Enhanced Airflow: Features full mesh panels for optimal ventilation and cooling performance.
Pre-installed Fans: Comes with two slim 120mm non-RGB fans for immediate cooling out of the box.
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.

Full Specifications

Brand	Lian Li
Color	Black
Material	Mesh, Steel 4.0mm
Case Type	Mid Tower
Model Name	B4X
Unit Count	1 Count
Model Number	B4X
Compatibility	PC
Compact Design	21.3-liter small form factor case designed for mATX motherboards and GPUs up to 358mm.
Cooling Method	Air
Number of Fans	2
Mfr Part Number	B4X
Antenna Location	Gaming, Personal Computer
Enhanced Airflow	Features full mesh panels for optimal ventilation and cooling performance.
Compatible Devices	Desktop, Power Supply: ATX (Up to 140mm) / SFX
Enclosure Material	Mesh, Steel 4.0mm
Pre-installed Fans	Comes with two slim 120mm non-RGB fans for immediate cooling out of the box.
Warranty Description	1 Year Manufacturer
Easy Cable Management	Rotatable AC inlet and ample rear clearance for tidy cable organization in both orientations.
Supported Motherboard	Micro-ATX, Mini ITX
Full listing title	Lian Li B4-mATX 21.3L PC Case, 358mm GPU, 360 AIO, 2 Slim Fans, Black Mesh \| 2 Pre-Installed 120mm Slim Top Fans, Supports 360mm AIO, 140mm ATX PSU, Horizontal/Vertical Setup, Small Form Factor (B4X)

Ready to buy?

Amazon shows no buyable offer for Lian Li B4-mATX 21.3L PC Case at the last check. A similar in-stock product is Okinos 314 ARGB. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Similar — $54.99