LIAN LI B4 mATX Black

The LIAN LI B4 mATX is a compact 21.3‑litre micro‑ATX/Mini‑ITX case that balances a small footprint with broad hardware compatibility. It’s aimed at builders who want a powerful gaming or workstation system in a space‑efficient chassis with flexible cooling options and both horizontal and vertical orientations.

The case accommodates 4‑slot GPUs up to 358 mm, full‑size ATX PSUs up to 140 mm or SFX units, and supports radiators up to 360 mm when using an SFX PSU (240 mm with an ATX PSU). It supports up to nine fans, ships with two slim 120×15 mm top fans, includes a magnetic bottom dust filter and removable brackets to simplify cable routing and large GPU installation—features that make assembly and thermal tuning straightforward.

Available in mesh or real‑wood panel finishes and compatible with an optional Vertical AeroDeck accessory for improved GPU airflow, the B4‑mATX is suitable for compact gaming rigs, liquid‑cooled builds, or space‑conscious workstations.

Specifications

• Case form factor: Micro‑ATX / Mini‑ITX
• Volume: 21.3 L
• Dimensions (D×W×H): 420 × 191 × 288 mm
• GPU clearance: up to 358 mm (4‑slot)
• PSU support: ATX (up to 140 mm) / SFX
• CPU cooler height: 159 mm (165 mm without side fan bracket)
• Radiator support: up to 360/280/240 mm (with SFX PSU); 240 mm (with ATX PSU)
• Included fans: 2 × 120 × 15 mm (top, pre‑installed)
• Max fan support: up to 9 fans (top/side/bottom/rear/front)
• Drive bays: Front: 1 × 2.5" SSD; Bottom: 1 × 3.5" HDD or 1 × 2.5" SSD
• Material: Steel (Mesh or Wood panel options)
• I/O ports: 2 × USB 3.0 Type‑A, 1 × USB 3.2 Type‑C, audio, power button