Lian Li DAN B4-MATX Mesh Black Compact Gaming Case, 21.3L, Micro-ATX & Mini-ITX, 358mm 4-Slot GPU, 140mm ATX PSU, Mesh Front Panel | G99.B4X.00

The Lian Li DAN B4-MATX Mesh Black is a landmark compact gaming case that bridges the gap between the ultra-minimal SFF Mini-ITX segment and the mainstream Micro-ATX mid-tower category — creating a new chassis class that delivers Micro-ATX motherboard compatibility, full-length 4-slot GPU support up to 358mm, and standard 140mm ATX power supply accommodation in a remarkably compact 21.3 liter volume that approaches SFF dimensions while enabling the broader component selection, expanded memory capacity, and greater feature integration that Micro-ATX platforms provide over Mini-ITX alternatives. The DAN collaboration's engineering philosophy — proven across the acclaimed A4-H20 SFF series and now applied to the Micro-ATX format — prioritizes spatial efficiency without thermal compromise, delivering a chassis that uses every available millimeter of its 21.3 liter volume with engineering precision that creates far greater internal capability than the external footprint suggests. The mesh front panel ensures that the B4-MATX's compact volume receives the maximum possible fresh air intake — the open mesh construction eliminating the airflow restriction of solid panel alternatives and enabling the B4-MATX to maintain effective thermal management for the high-performance Micro-ATX component configurations that its GPU and PSU clearances accommodate. For builders who have wanted the space efficiency of SFF computing with the platform versatility of Micro-ATX motherboards, the flexibility of standard ATX power supplies, and the GPU clearance for 4-slot flagship graphics cards — all in a single chassis that refuses to compromise on any of these requirements simultaneously — the Lian Li DAN B4-MATX Mesh Black is the compact Micro-ATX gaming case that makes the complete vision achievable.

Performance / Technology

The B4-MATX's 21.3 liter volume is the specification that most precisely characterizes its unique market position — 21.3 liters is substantially smaller than typical Micro-ATX mid-tower cases that range from 30 to 50+ liters, yet meaningfully larger than the 11-13 liter volumes of the most compact SFF cases like the A4-H20. This intermediate volume is not a compromise between competing design requirements — it is the precise minimum volume required to accommodate Micro-ATX motherboards, 358mm 4-slot GPUs, 140mm ATX PSUs, and adequate cooling provisions simultaneously, achieved through the spatial engineering precision that the DAN collaboration has refined across multiple SFF chassis generations.

The 358mm GPU length clearance combined with 4-slot thickness support represents an exceptional GPU compatibility specification for a 21.3 liter chassis — enabling the installation of the largest and most powerful current-generation graphics cards including triple-fan and quad-fan variants of the NVIDIA RTX 5080, RTX 5090, AMD RX 9070 XT, and equivalent flagship GPUs that other compact Micro-ATX cases cannot physically accommodate. This clearance specification ensures that the B4-MATX's compact volume does not become a performance limitation through GPU selection constraints — builders can pair the compact chassis with the most powerful GPU their budget and performance requirements demand rather than accepting a lower-tier GPU that fits a less generous clearance specification.

Why This Product Stands Out

The Lian Li DAN B4-MATX Mesh Black stands out in the compact gaming case market by creating a genuinely new chassis category — the compact Micro-ATX case that simultaneously achieves 21.3L SFF-adjacent volume, 358mm 4-slot GPU clearance, 140mm ATX PSU compatibility, and mesh front panel thermal performance. No competing compact Micro-ATX case achieves all four of these specifications simultaneously — the combinations that competitors offer always require compromising one dimension: accepting SFX PSU limitation, reducing GPU clearance, increasing chassis volume, or sacrificing front panel airflow quality. The DAN B4-MATX refuses all four compromises — delivering the complete specification that compact Micro-ATX builders have been searching for in a single chassis that honors the DAN collaboration's engineering reputation for precision spatial efficiency without thermal compromise.