Lian Li

Lian Li B4-mATX

Ranked #9 in PC Cases

575 LP on the category ladder what's LP?

Three independent reviews praise its convertible design, airflow, and build quality. The rare compact case with no meaningful compatibility compromise.

Consolidated from 4 independent outlets

Where the cited sources landed, as we read them

1 glowing source
3 positive sources

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Pros & cons

✓ Clever convertible design allowing easy transitions between horizontal and vertical layouts
✓ Outstanding airflow with support for high-end hardware and a 360mm radiator
✓ Takes a full-size ATX power supply without compromise
✓ Solid combination of build quality, hardware compatibility, and sensible pricing
✓ Strong value, clever modularity, and fine build quality for the money

✗ Convertible designs are a long-term risk in principle, though reviews found the execution solid

The sources behind this ranking

We searched the web and YouTube for what has been published about this product, then read the articles, video transcripts and comments we found. 1 outlet wouldn't let us check its link.

1 glowing source

TechPowerUp Combatus (TPU) · reviewer · Jun 2026

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.

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3 positive sources

PCMag Middle East Article · Aug 2026

Strong value, clever modularity, and fine build quality for the money make the Lian Li x DAN Cases B4-mATX collaboration a standout MicroATX chassis—provided you plan your component clearances and cable routing carefully.

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KitGuru Article Read T

TweakTown Article Read

Frequently asked questions

It ranks #9 of 29 on our PC cases tier list, in B tier. That placement draws on 4 independent outlets.

None of the 4 sources with a clear view is critical of it. Convertible designs are a long-term risk in principle, though reviews found the execution solid.