Lian Li B4-mATX

Lian Li B4-mATX
● HIGHLY RATED
Site Score
4.5 / 5.0
Buyer Guidance: An exceptionally versatile 21.3-liter enclosure for builders seeking high-end GPU and cooling clearance in an mATX footprint, provided power supply and radiator dimensions are planned in advance.
Mizex Audit Breakdown
Engineering & Core Performance (30%) 4.5 / 5.0
Build Quality & Physical Design (20%) 4.4 / 5.0
Thermal, Power & Acoustics (20%) 4.5 / 5.0
Reliability & Stability (20%) 4.6 / 5.0
Buyer Value (10%) 4.5 / 5.0
Score Rationale
Uncompromising component clearance within a 21.3-liter enclosure anchors the composite rating of 4.5. Engineering & Architecture (4.5) demonstrates clever packaging co-developed with DAN Cases, accommodating 358 mm GPUs and 162 mm tower coolers, albeit restricting ATX power supplies to 140 mm. Build quality (4.4) benefits from a rigid steel chassis and precision mesh panels. Thermal management (4.5) excels via pervasive mesh ventilation and two included 120 mm slim fans pushing up to 64.2 CFM and 2.4 mmH2O. Long-term reliability (4.6) is reinforced by simple, durable mechanical fixtures and standard fan mountings, while buyer value (4.5) stands out by permitting mainstream Micro-ATX motherboards and budget-friendly hardware without demanding exclusive SFF hardware premiums.
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Overview

Occupying a compact 21.3-liter desk footprint, the chassis achieves uncommon packaging density through an adaptable internal layout developed in collaboration with DAN Cases that operates seamlessly in either vertical or horizontal orientations. Measuring 420 mm by 191 mm by 288 mm, the steel frame integrates high-permeability mesh panels—with optional real wood accents—to balance structural rigidity against unrestricted ambient airflow, supported by a rotatable AC inlet and dedicated rear cable routing clearance.

Internally, structural architecture maximizes hardware compatibility beyond conventional small-form-factor limits. The modular mounting system supports both Micro-ATX and Mini-ITX motherboards alongside full-sized graphics cards up to 358 mm in length and CPU air coolers up to 162 mm tall. Power supply integration accommodates compact ATX units up to 140 mm or SFX supplies; opting for an SFX power supply unlocks mounting headroom for up to a 360 mm liquid cooling radiator. Thermal dissipation relies on full-perimeter mesh perforation backed by two pre-installed 120 mm slim fans operating from 0 to 1800 RPM, delivering up to 64.2 CFM of airflow and 2.4 mmH2O of static pressure across critical motherboard and GPU chambers.

From a builder’s perspective, assembly requires deliberate sequencing due to clearance trade-offs between cooling hardware and power supply dimensions. Restricting ATX power supply length to 140 mm necessitates careful modular cable selection, and utilizing a 360 mm radiator strictly precludes ATX units in favor of SFX platforms. Nonetheless, the reliance on robust steel tooling, standard 2.5-inch drive accommodations, and modular bracket design provides long-term mechanical resilience without the fragility or proprietary constraints common to sub-25-liter enclosures.

Technical Specifications

Brand Lian Li
Model B4-mATX
Case Type Small Form Factor (SFF) Mini Tower
Case Volume 21.3 L
Dimensions 420 mm x 191 mm x 288 mm
Materials Steel, Mesh (optional Real Wood panel)
Supported Motherboards Micro-ATX, Mini-ITX
Orientation Horizontal or Vertical
Max Gpu Length 358 mm
Max Cpu Cooler Height 162 mm
Max Psu Length 140 mm (ATX)
Supported Psu Form Factors ATX (max 140 mm), SFX
Radiator Support Up to 360 mm AIO (with SFX PSU)
Fan Mount Locations Front (120 mm), Rear (120 mm), Bottom (120 mm), Side (120 mm)
Preinstalled Fans 2 x 120 mm slim fans
Fan Speed 0 - 1800 RPM
Fan Max Airflow 64.2 CFM
Fan Max Air Pressure 2.4 mmH2O
Storage Drive Support 2.5" SSD
Cable Management Rear clearance routing
Ac Inlet Rotatable AC inlet
✔ Pros
  • Dense 21.3-liter dual-orientation enclosure supporting both horizontal and vertical placement
  • Generous clearance for up to 358mm GPUs and 162mm tall CPU air coolers
  • Comprehensive ventilation with full mesh panels and two included 120mm slim PWM fans
  • Supports up to a 360mm liquid cooling radiator when configured with an SFX power supply
✖ Cons
  • Installing a 360mm radiator mandates an SFX power supply instead of standard ATX
  • ATX power supply compatibility is constrained to a maximum depth of 140mm
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Primary Sources & Audited Citations

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At a Glance

How reliable is the Lian Li B4-mATX according to Mizex audits?
Mizex Composite Score: 4.5 / 5.0 ● HIGHLY RATED

An exceptionally versatile 21.3-liter enclosure for builders seeking high-end GPU and cooling clearance in an mATX footprint, provided power supply and radiator dimensions are planned in advance.

What are the known quirks or drawbacks of the Lian Li B4-mATX?

Our reliability audit identified the following documented caveats:

  • Installing a 360mm radiator mandates an SFX power supply instead of standard ATX
  • ATX power supply compatibility is constrained to a maximum depth of 140mm
What are the key engineering highlights of the Lian Li B4-mATX?

The top strengths recorded in our evaluation include:

  • Dense 21.3-liter dual-orientation enclosure supporting both horizontal and vertical placement
  • Generous clearance for up to 358mm GPUs and 162mm tall CPU air coolers
  • Comprehensive ventilation with full mesh panels and two included 120mm slim PWM fans
  • Supports up to a 360mm liquid cooling radiator when configured with an SFX power supply
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