Description
Designed to build like never B4, the B4-mATX brings premium flexibility to a compact 21.3L form factor. It supports horizontal and vertical orientations, with a rotatable AC inlet designed to accommodate both layout modes. Inside, it supports M-ATX motherboards, up to 358mm 4-slot GPUs, and two pre-installed 15mm slim fans. With SFX PSU configurations, it enables front slim fan installation, up to 360mm AIO support, and optimized airflow layouts through adjustable rear fan bracket positioning. For ATX PSU builds, it supports up to 240mm AIO cooling or large air coolers, while the optional Vertical AeroDeck accessory delivers direct airflow to the GPU for enhanced thermal performance.
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Amazon (Available starting June. 26. 2026, 9:00AM EST):
- B4-mATX Mesh Black: https://www.amazon.com/dp/B0GX5DM6KB
- B4-mATX Mesh White: https://www.amazon.com/dp/B0GX5HP57Y
- B4-mATX Wood Black: https://www.amazon.com/dp/B0GX5D2FHW
- B4-mATX Wood White: https://www.amazon.com/dp/B0GX552844
- B4-mATX Vertical AeroDeck Black: https://www.amazon.com/dp/B0GX5FZTYC
- B4-mATX Vertical AeroDeck White: https://www.amazon.com/dp/B0GX53GPYL
Newegg (Available starting June. 26, 9:00AM EST):
- B4-mATX Mesh Black: https://www.newegg.com/p/pl?d=9SIAFSTKV38658
- B4-mATX Mesh White: https://www.newegg.com/p/pl?d=9SIAFSTKV38657
- B4-mATX Wood Black: https://www.newegg.com/p/pl?d=9SIAFSTKV39355
- B4-mATX Wood White: https://www.newegg.com/p/pl?d=9SIAFSTKV39356
- B4-mATX Vertical AeroDeck Black: https://www.newegg.com/p/pl?d=9SIAFSTKV38659
- B4-mATX Vertical AeroDeck White: https://www.newegg.com/p/pl?d=9SIAFSTKV38656
CaseKing (Available starting: June. 26. 2026, 3:00 PM CEST)
- B4-mATX Mesh Black: https://www.caseking.de/lian-li-dan-cases-b4-micro-atx-gehaeuse-schwarz/GELI-1000.html
- B4-mATX Mesh White: https://www.caseking.de/lian-li-dan-cases-b4-micro-atx-gehaeuse-weiss/GELI-1001.html
- B4-mATX Wood Black: https://www.caseking.de/lian-li-dan-cases-b4-wood-edition-micro-atx-gehaeuse-walnuss-schwarz/GELI-1002.html
- B4-mATX Wood White: https://www.caseking.de/lian-li-dan-cases-b4-wood-edition-micro-atx-gehaeuse-buche-weiss/GELI-1003.html
- B4-mATX Vertical AeroDeck Black: https://www.caseking.de/lian-li-dan-cases-b4-vertical-aerodeck-schwarz/GELI-1004.html
- B4-mATX Vertical AeroDeck White: https://www.caseking.de/lian-li-dan-cases-b4-vertical-aerodeck-weiss/GELI-1005.html
SCAN (Available starting: June. 26. 2026 ,2:00 PM BST)
- B4-mATX Mesh Black: https://www.scan.co.uk/products/lian-li-b4-matx-chassis-small-form-factor-black-2x-120mm-fans-usb-c-usb-a-35mm-matx
- B4-mATX Mesh White: https://www.scan.co.uk/products/lian-li-b4-matx-chassis-small-form-factor-white-2x-120mm-fans-usb-c-usb-a-35mm-matx
- B4-mATX Wood Black: https://www.scan.co.uk/products/lian-li-b4-matx-wood-chassis-small-form-factor-black-2x-120mm-fans-usb-c-usb-a-35mm-matx
- B4-mATX Wood White: https://www.scan.co.uk/products/lian-li-b4-matx-wood-chassis-small-form-factor-white-2x-120mm-fans-usb-c-usb-a-35mm-matx
Overclockers UK (Available starting: June. 26. 2026, 2:00 PM BST)
https://www.overclockers.co.uk/cases-and-modding?manufacturer%5B0%5D=Lian+Li&pim_product_family_series%5B0%5D=B4
PB TECH (Available starting: June. 26. 2026, 11:00 PM AEST)
- B4-mATX Mesh Black: https://www.pbtech.co.nz/product/CHALAN2231
- B4-mATX Mesh White: https://www.pbtech.co.nz/product/CHALAN2232
Learn more ▶
https://lian-li.com/product/b4-matx/