Lian Li’s new B4‑mATX case arrives as a compact, convertible chassis aimed at budget‑conscious builders. For $70, the steel‑and‑plastic box shifts between horizontal and vertical orientations without tools, a trick that lets users adapt to cramped desks or showcase builds. Its dimensions—407 × 191 × 208 mm—place it squarely in the micro‑ATX sweet spot.

Beyond its shape‑shifting gimmick, the B4‑mATX packs serious cooling headroom. It supports up to a 360 mm side‑mounted radiator when paired with an SFX PSU, while still accommodating ATX power supplies and GPUs up to 358 mm long. Four internal drive bays and multiple fan mounts—two 120 mm on top, three at the bottom—offer flexibility for air or liquid loops.

The case retains the aesthetic polish Lian Li is known for, with a brushed steel frame and optional color kits that echo the brand’s earlier A3‑m series. Despite its modest price, reviewers note the build quality rivals higher‑end offerings, making the B4‑mATX a compelling choice for anyone needing a versatile, well‑cooled micro‑ATX platform today.

Because it accommodates both ATX and SFX power supplies, the B4‑mATX can host high‑performance GPUs without sacrificing clearance, a rare feat at this price point. Combined with its USB‑C front panel and ample fan headers, the chassis offers a complete solution for small‑form‑factor enthusiasts seeking performance without breaking the bank.