Lian Li B4-mATX Mini Tower Case Without Window - G99.B4W.00

This is a compact mATX case Lian Li B4 in Mini Tower format, aimed at smaller but serious gaming and workhorse configurations. Without a window and without RGB, the focus is on functionality, cooling, and a clean look, not on a light show. Support for graphics cards up to 358 mm and cooling radiators up to 360 mm makes it surprisingly capable for powerful systems. The case is white, with a massive 4.0mm steel construction, which gives you stability and a feeling of a “real” case, not tin.

What you get

You get a Mini Tower for mATX motherboards, which comfortably accommodates long GPUs up to 358 mm without forcing you to cut cages and move devices. Cooling is well thought out – you have included 2 x 120mm slim non-RGB fans right from the box and an option for additional 2 x 120mm or up to 3 x 120mm / 2 x 140mm AeroDeck fans for more serious airflow. If you want water cooling, you can install a 360mm radiator with SFX PSU or a 240mm radiator with ATX PSU, which gives you a choice between a more compact power supply and a larger radiator or standard ATX and a shorter radiator. The presence of dedicated mounting brackets for ATX and SFX means you are not locked into one PSU format and can optimize the internal space according to the configuration.

• Mini Tower format for mATX motherboards, which combines a smaller footprint with enough space for serious hardware.
• Support for graphics cards up to 358 mm, which allows installation of long, high-end GPUs without compromise.
• Maximum CPU cooler height 162 mm, so you can use massive air coolers, not just low-profile solutions.
• Flexible water cooling support – 360mm radiator with SFX PSU or 240mm radiator with ATX PSU depending on what is more important to you: cooling or standard power supply.
• Includes 2 x 120mm slim non-RGB fans, so you have basic cooling right from the box, without having to buy additional fans immediately.
• Supported fans: up to 2 x 120mm standard and 3 x 120mm / 2 x 140mm AeroDeck, which gives you freedom to build airflow according to needs and noise.
• I/O panel with 1 x USB Type-C, 2 x USB Type-A and 1 x HD Audio, so your most frequently used devices are within reach.
• 1 x 3.5" and 2 x 2.5" drive bays – enough for a modern combination of SSD for system and HDD/SSD for storage.
• Construction from 4.0mm steel and compact size 420 x 191 x 288 mm for a stable but still easy-to-place case.
• Support for PSU with length up to 140 mm and dedicated mounting brackets for ATX and SFX, to plan cable management and cooling space more precisely.

Who it is suitable for

This case is good for mATX builds where you want a powerful GPU, decent cooling, and a clean, unobtrusive look without a glass window and RGB. Suitable for gaming systems, a compact productivity build, or a machine that will stand in a visible place, but without the “Christmas tree” effect. If you chase maximum RGB show and constantly want to look at your hardware, the lack of a window and lighting may not appeal to you.

The combination of compact dimensions, solid steel construction, and the ability to accommodate a long graphics card and serious cooling makes Lian Li B4-mATX a sensible choice if you are looking for a practical and clean design case. Flexibility with ATX/SFX PSU and the choice between 240/360mm radiators are its strongest sides.