Lian Li B4-mATX 21.3L PC Case, 358mm GPU, 360 AIO, 2 Slim
Lian Li B4-mATX 21.3L PC Case, 358mm GPU, 360 AIO, 2 Slim Fans, Black Wood 2 Pre-Installed 120mm Slim Top Fans, Supports 360mm AIO, 140mm ATX PSU, Horizontal/Vertical Setup, Small Form Factor (B4X-WD)
- Pre-installed Fans: Comes with two slim 120mm non-RGB fans for immediate cooling out of the box.
- Elegant Aesthetic with Premium Real Wood Finish: Available in black walnut or white beech wood finishes for a stylish look.
- Strong Hardware Compatibility: Supports mATX motherboards, GPUs up to 358mm, and CPU coolers up to 165mm tall.
- Dual Positioning: Use horizontally for a desktop blend or vertically for a space-saving tower design.
- Customizable Cooling Configurations: Offers flexibility for additional fans and radiators based on PSU choice.
| Product Name | LIAN LI B4-mATX |
| Case Type & Volume | Compact 21.3L Micro-ATX PC Case |
| Motherboard Support | Micro-ATX / Mini-ITX |
| Dimensions | 420 x 191 x 288 mm (D x W x H) |
| GPU Clearance | Supports graphics cards up to 358 mm long and up to 4 slots thick |
| CPU Cooler Clearance | Up to 165 mm |
| PSU Support | ATX power supplies up to 140 mm or SFX power supplies |
| Radiator Support | Side: up to 360 mm / 280 mm / 240 mm with SFX PSU, up to 240 mm with ATX PSU |
| Fan Support | Supports up to 9 fans total across top, side, bottom, rear, and front |
| Included Fans | 2 x 120 x 120 x 15 mm slim top fans pre-installed |
| I/O Ports | 2 x USB 3.0 Type-A, 1 x USB 3.2 Type-C, 1 x Audio, 1 x Power Button |
| Layout Support | Supports both horizontal and vertical configurations |
B4-mATX Vertical AeroDeck
| Add to Cart Add to Cart Add to Cart Add to Cart | ||||||
| Price | $29.99$29.99 | $29.99$29.99 | $91.40$91.40 | — | $73.45$73.45 | — |
| Best For | Inhanced airflow accessory | Inhanced airflow accessory | Style-forward builds | Style-forward builds | Airflow-focused builds | Airflow-focused builds |
| Front Panel Style | Wood Accent | Wood Accent | Wood Accent | Wood Accent | Mesh | Mesh |
| Included Cooling | Up to 3x120mm or 2x 240mm | Up to 3x120mm or 2x 240mm | 2 x 120mm Slim Top Fans | 2 x 120mm Slim Top Fans | 2 x 120mm Slim Top Fans | 2 x 120mm Slim Top Fans |
| Radiator Support | NA | NA | Up to 360mm | Up to 360mm | Up to 360mm | Up to 360mm |
| GPU Clearance | NA | NA | Up to 358mm | Up to 358mm | Up to 358mm | Up to 358mm |
| CPU Cooler Clearance | NA | NA | Up to 165mm | Up to 165mm | Up to 165mm | Up to 165mm |
| SKU: | B0GX5D2FHW |
| Weight: | 11 pounds |
| Brand: | Lian Li |
| Model: | B4X-WD |
| Colour: | Black |
| Manufacture: | LIAN LI |
| Colour: | Black |
Product description
| Product Name | LIAN LI B4-mATX |
| Case Type & Volume | Compact 21.3L Micro-ATX PC Case |
| Motherboard Support | Micro-ATX / Mini-ITX |
| Dimensions | 420 x 191 x 288 mm (D x W x H) |
| GPU Clearance | Supports graphics cards up to 358 mm long and up to 4 slots thick |
| CPU Cooler Clearance | Up to 165 mm |
| PSU Support | ATX power supplies up to 140 mm or SFX power supplies |
| Radiator Support | Side: up to 360 mm / 280 mm / 240 mm with SFX PSU, up to 240 mm with ATX PSU |
| Fan Support | Supports up to 9 fans total across top, side, bottom, rear, and front |
| Included Fans | 2 x 120 x 120 x 15 mm slim top fans pre-installed |
| I/O Ports | 2 x USB 3.0 Type-A, 1 x USB 3.2 Type-C, 1 x Audio, 1 x Power Button |
| Layout Support | Supports both horizontal and vertical configurations |
B4-mATX Vertical AeroDeck
 Vertical AeroDeck Black |  Vertical AeroDeck White |  Wood Black Case |  Wood White Case |  Mesh Black Case |  Mesh White Case | |
|---|---|---|---|---|---|---|
| Price | $29.99 | $29.99 | $91.40 | — | $73.45 | — |
| Best For | Inhanced airflow accessory | Inhanced airflow accessory | Style-forward builds | Style-forward builds | Airflow-focused builds | Airflow-focused builds |
| Front Panel Style | Wood Accent | Wood Accent | Wood Accent | Wood Accent | Mesh | Mesh |
| Included Cooling | Up to 3x120mm or 2x 240mm | Up to 3x120mm or 2x 240mm | 2 x 120mm Slim Top Fans | 2 x 120mm Slim Top Fans | 2 x 120mm Slim Top Fans | 2 x 120mm Slim Top Fans |
| Radiator Support | NA | NA | Up to 360mm | Up to 360mm | Up to 360mm | Up to 360mm |
| GPU Clearance | NA | NA | Up to 358mm | Up to 358mm | Up to 358mm | Up to 358mm |
| CPU Cooler Clearance | NA | NA | Up to 165mm | Up to 165mm | Up to 165mm | Up to 165mm |
I wanted to upgrade my server (running Fedora on an i7-10700/32GB RAM) to a larger case so I could fit both an Intel B580 Arc and a 14TB HDD I had lying around. This was just the thing. Got a bunch of low noise fans and a large Peerless Assassin 120mm SE cooler, which just barely fit over the ram sticks and under the side fan bracket.
Make sure to position the rear metal fan grill outwards instead of inwards if you’re getting a large tower cooler as inwards doesn’t fit. The SFX PSU was def a must as I can’t imagine how awful it would be to route cables with an ATX PSU.
I’m using an ITX mobo, but an mATX would def fit fine as well. For the price, you can’t really beat it. It’s running fairly cool and quiet after I set my fan curves up in the bios. It’s also small enough to fit on top of my file cabinet tucked away in a corner and not attract attention.
Great box, great looking.
This was my first PC build, and I had a great time using this case and enjoy the aesthetic. I read the manual thoroughly which helped, and also I would look at tutorials and build videos.
It helped me visualize and understand how the case really worked.
I would recommend buying a fan splitter and to double check your motherboard USB connection since I had to purchase an adapter since my motherboard used an older connection. All in all, with very minor tweaks it worked very well for me
Outstanding quality, sleek aesthetics, and super fast shipping!
Premium build quality from top to bottom. The wood accent on the front panel looks stunning in person and gives it a very clean, minimalist aesthetic. Despite its compact size (~20L), building inside it was surprisingly straightforward if you plan your cable management properly. Thermal performance is solid as well, the airflow is surprisingly impressive and keeps my temps very cool under heavy gaming sessions.
Also, international delivery to Argentina via Amazon Global was incredibly fast and smooth. Extremely satisfied with this purchase! 5/5 stars!
This case is a very good sized mATX case. It’s about the smallest I have found. However, my unit arrived opened. It was fine as there was no damage to the case itself and it appeared that nothing was missing inside the box. The case is very modular which is nice, but some areas are made of plastic (like the back of the front panel). Some areas feel a little flimsy but not overly flimsy. This is ok because of the modular design of the case. I do feel like you are a little forced to spend extra money on a SFX PSU, as an ATX PSU will take up a considerable amount of space in this small case. The outside of the case looks big, but once you open it up, it is very small on the inside. I love the fact that you can place the computer vertically or horizontally. I can assure you, it is not a gimmick. The case feels solid in both of those configurations. There is plenty of room on the bottom in vertical mode for cables and standard size dongles. The big issue for me (and why I decided to return it) is that there is no cable management section in this case. You will have to watch videos, exercise patience, and get creative with your cable management. Since I am a first time builder, I decided to go with the Jonsbo D32 Pro mATX case. It fits my needs better as I want an ATX PSU and aside from that, it does have a section for cables (at least I know exactly how I will route the cables). That cable section just makes things a little easier for a first time PC builder like me. If you’re ok with not having a cable management section and some areas that feel slightly loose, this case is a banger. Solid I/O, solid power button, vertical/horizonal styling with ease, and even two built in fans that are actually usable.
Lowkey the GOAT
No complaints, it is better than I ever expected it to be
I got a nh-u12a cooler, fits flawlessly, 4 noctua fans for front intake rear exauste and substituting the 2 built in fans (they lowkey noisy), and yes, full size fans fit on the top but ur mileage may vary.
Case is sleek, this wood version is surprisingly premium felling, everything is well thought out.
The only note I have is to buy a SFX psu to make cable managing tolerable, front fan intake possible, 360 aio compatible, longer gpu compatible. ATX may work for some, but just get a SFX and enjoy the case at is best.
Also no idea how it cost only 80, I would pay double easy, great value for the money!