Lian Li and Dan have launched their newest collaboration, the B4-mATX, an mATX Small Form Factor (SFF) case expected in 2026. The case is designed for enthusiasts who desire high-end components within a compact footprint.
The B4-mATX has a volume of 21.3 liters and measures 420mm x 191mm x 288mm, constructed from 4.0mm steel. It supports both Mini-ITX and M-ATX motherboards.
In terms of cooling compatibility, the case supports up to a 360mm AIO radiator on the side panel. Furthermore, it features pre-installed top exhaust fans: two 120mm, 15mm thick units.
The GPU card length is supported up to 358mm, and the CPU cooler height capacity is 162mm (or 168mm without the side fan bracket).
The base model, the B4-mATX Mesh, is priced at an MSRP of $69.99. Users can opt for a white color for only a $5 upcharge. Additional options include wood accents on the front panel for $84.99 (black) or $89.99 (white). A vertical AeroDeck front panel can be added for an extra $29.99.
The case is equipped with multiple features, including a full-length dust filter at the underside and an invertible 120mm motherboard fan location at the rear if the optional AeroDeck layout is chosen.
Front/top I/O includes two USB 3.0 Type-A ports, a combo 3.5 mm mic/headset jack, a round power button, and a USB Type-C port.
Internally, the design accommodates multiple storage options, with space for one 3.5” drive and up to two 2.5” drives. A critical detail for advanced builds is that all cabling is routed to the PSU cage, which can be removed, allowing for the use of an SFX power supply.
The thermal performance was tested using a system featuring an AMD Ryzen 9 7900 CPU and a Zotac Trinity RTX 3090 GPU. During a seven-hour stability test, the Ryzen 9 7900 maintained average temperatures of just 62.1 °C, confirming excellent cooling capability for this high-powered component.
The maximum temperature recorded for the RTX 3090 was 82 °C, demonstrating that the case’s airflow setup successfully managed top-tier GPU heat loads under demanding use.
While utilizing a 360mm AIO requires adhering to specific spatial constraints, such as committing to an SFX power supply and using a thin 25mm liquid cooler profile, the B4-mATX balances its small size with exceptional versatility. Its mesh design contributes significantly to excellent airflow, making it a strong contender in the budget-friendly SFF market.
Source: TweakTown