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Lian Li B4-mATX Review
21:05 by wheresmycar · 2026-06-25 · via TechPowerUp

Introduction

Lian Li Logo

I would like to thank Lian Li for supplying the review sample.

We've seen a number of decent compact sub $100 microATX cases over the last couple of years, and Lian Li itself in collaboration with DAN Cases was behind one of the best with the very affordable A3-mATX. It's from identical beginnings that the B4-mATX finds its way onto our test bench. However, this isn't a re-spun version of that original case, but something that's quite different. Here we have a convertible case that's able to switch between horizontal and vertical layouts with minimal fuss, yet still maintains excellent air and liquid-cooling support as well as allowing for ATX PSUs and large graphics cards.

As you'd expect given the plethora of colors and accessories available for the original A3-mATX, the new B4-mATX offers a range of options from the start, but also some optional additional accessories to bolster its credentials in vertical mode too. More on that later. Perhaps more importantly, the B4-mATX starts at just $70, so if the high cost of hardware right now sees you feeling more of a fun, sideways move rather than expensive upgrade, then keep reading.

Specifications

Lian Li B4-mATX
Case Type:microATX convertible tower
Material:Steel, plastic
Weight:N/A
Slots:4
Drive Bays: 1× Internal 2.5/3.5"
1× Internal 2.5"
Motherboard
Form Factors:
Mini-ITX, microATX
Dimensions:420 × 191 × 288 mm
Front Door/Cover:N/A
Front Fans:1× Slim 120 mm (with SFX PSU, optional)
Rear Fans:1× 120 mm (optional)
Top Fans:2× 120 mm (2× Lian Li slim 120 mm fans installed)
Bottom Fans:3× 120/2× 140 mm (optional)
Side Fans:2× 120/2× 140 mm (ATX PSU), 3× 120/2× 140 mm (SFX PSU) (optional)
Front Radiator:N/A
Rear Radiator:N/A
Top Radiator:N/A
Bottom Radiator:N/A
Side Radiator:360 mm (SFX PSU), 240 mm (ATX PSU)
I/O: 1× USB 3.2 Gen 2 Type-C
2× USB 3.0
1× Headphone jack
Fan/LED Controller:N/A
Compatibility: CPU Cooler: 162 mm (168 mm without side fan bracket)
GPU: 358 mm
PSU: ATX (limited to 140 mm), SFX