Description

Lian Li B4-mATX Mesh SFF PC Case: A 21.3-Litre Case That Still Takes a Full-Size Graphics Card

Introduction

The Lian Li B4-mATX is a 21.3-litre small form factor case for Micro-ATX and Mini-ITX boards. It ships with two slim 120mm fans in the roof and still makes room for a 358mm, four-slot graphics card and a normal ATX power supply. It can stand horizontally or, with Lian Li’s optional AeroDeck stand, vertically. Here is what the layout means for a real build.

1. Size and Layout

At 420 x 191 x 288mm the B4 takes up about as much desk space as a shoebox. The motherboard and graphics card sit side by side, which is why a long four-slot card fits in a case this small.

2. Graphics Card and CPU Cooler Clearance

Cards up to 358mm long and four slots thick fit, covering most current high-end graphics cards. Tower air coolers up to 159mm tall fit with the side fan bracket installed, or 165mm without it.

3. Power Supply Options

It takes an ATX power supply up to 140mm long, or an SFX unit, so you can use a standard ATX PSU instead of a more expensive SFX model. The Lian Li SX Platinum series, at 140mm long, is a clean match.

4. Liquid Cooling

With an SFX power supply the side mount takes a 360mm, 280mm or 240mm radiator. With an ATX power supply the side mount is limited to 240mm, so plan the PSU and cooler together.

5. Fans and Storage

Two 120 x 120 x 15mm slim fans are pre-installed on top. The bottom takes up to three 120mm or two 140mm fans and the rear one 120mm fan, with a magnetic dust filter underneath. Storage covers one 2.5-inch SSD at the front plus one 3.5-inch HDD or 2.5-inch SSD at the bottom.

6. Who It Is Best Suited For

The B4 suits anyone who wants full-power hardware in a small footprint, such as a desk with little space or a compact home-office machine, without dropping down to a small graphics card.

Conclusion

The Lian Li B4-mATX fits a large graphics card, an ATX power supply and a Micro-ATX board into 21.3 litres. Pair the PSU and cooler sensibly and it makes a very capable small desktop.

Frequently Asked Questions

Does it support ATX motherboards?

No. It supports Micro-ATX and Mini-ITX only.

Can I use a 360mm AIO with an ATX power supply?

No. A 360mm radiator fits on the side only with an SFX power supply; with ATX, the side takes a 240mm radiator.

How long can the graphics card be?

Up to 358mm and four slots thick.

Which fans are included?

Two 120mm slim fans in the top panel.

What warranty does it come with?

It comes with a 1-year warranty from Cores & Threads.