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MOTHERBOARDS

ASUS PRIME B550M-A

UK manufacturer specification

CPU socket
AM4
Chipset
AMD B550
Form factor and dimensions
mATX Form Factor 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm )

PRIME B550M-A motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.

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THE ACTUAL PRODUCT
ASUS PRIME B550M-A official product image
Official product image · Image source detailsProduct imagery does not establish a retailer’s bundle or condition.
Compare with ASUS PRIME B550M-A WIFI II
Explore alternativesUpgrade from this product

Specifications checked 17 Oct 2026Manufacturer specifications, not a hands-on test.

Options worth comparing

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The nearest checked motherboards by key specifications, with what differs from the ASUS PRIME B550M-A. The first matches the Compare button above.

The useful part.

Key strengths

Published motherboard interfaces and configuration are available from the exact-model ASUS specification source.

Manufacturer source
The checks that matter.

Before you buy

Compatibility and maximum operating modes depend on the source’s stated hardware, firmware and connection requirements; manufacturer figures are not independent measurements.

Manufacturer source
Build around it.

Works with

Products in this catalogue that list the same socket or memory type as the ASUS PRIME B550M-A. A shared socket or memory type is necessary but not sufficient: check the exact CPU and memory support lists, and the BIOS version, before buying.

Start a build with thisOpens My setups with the ASUS PRIME B550M-A in place and checks each part you add
Every specification. With its source.

Full specifications

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Exact configuration: UK manufacturer specification · PRIME B550M-A

10 specifications in 7 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.

Platform & board

3 items
CPU socket
AM4Source
Chipset
AMD B550Source
Form factor and dimensions
mATX Form Factor 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm )Source

Memory

1 item
Memory type, slots and limit
AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4600(O.C)/4400(O.C)/4266(O.C.)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3333(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory * AMD Ryzen™ 4000 G-Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4800(O.C.)/4600(O.C)/4466(O.C.)/4400(O.C)/4266(O.C.)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3333(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory * Dual Channel Memory Architecture ECC Memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).Source

Expansion slots

1 item
Expansion slots and restrictions
AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 1 x PCIe 4.0 x16 (x16 mode) AMD Ryzen™ 4000 G-Series Desktop Processors 1 x PCIe 3.0 x16 (x16 mode) AMD B550 Chipset 2 x PCIe 3.0 x1Source

Storage

1 item
Storage interfaces and restrictions
Total supports 2 x M.2 slot(s) and 4 x SATA 6Gb/s ports AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors: 1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110(PCIE 4.0 x4 and SATA modes) storage devices support AMD Ryzen™ 4000 G-Series Desktop Processors: 1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110(PCIE 3.0 x4 and SATA modes) storage devices support AMD B550 Chipset: 1 x M.2_2 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support 4 x SATA 6Gb/s port(s), Support Raid 0, 1, 10Source

Networking

1 item
Network interfaces and requirements
Realtek RTL8111H 1Gb EthernetSource

Audio

1 item
Audio interfaces
Realtek ALC887/897 7.1 Surround Sound High Definition Audio CODEC - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking, up to 24-Bit/192kHz playback Audio Feature: - LED-illuminated design - Audio Shielding - Dedicated audio PCB layers - Premium Japanese audio capacitors * Choose the chassis with HD audio module in front panel to support 8-channel audio output.Source

BIOS, software & diagnostics

2 items
CPU support and BIOS requirements
AMD AM4 Socket for AMD Ryzen™ 5000 Series/ 4000 G-Series/ 3000 Series Desktop Processors * * Refer to www.asus.com for CPU support list BIOS: 256 Mb Flash ROM, UEFI AMI BIOS

Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.

Source
Listed operating systems
Windows® 10 64-bitSource
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