We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green mATX motherboard with silver heatsinks and rear I/O shield

ASUS

ASUS PRIME B550M-A AC AMD motherboard

SKU CH-T6N5-DWSM2 MPN PRIME B550M-A AC

Micro-ATX AM4 board with PCIe 4.0 x16, dual M.2 slots, 802.11ac Wi-Fi, USB 3.2 Gen 2 Type-A and four DDR4 slots up to 128 GB

  • ProcessorSupports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Seri
  • ChipsetAMD B550
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 4866(OC) / 4800(OC) / 4600(OC) / 4466(OC) / 4400(OC) /
  • Ready for Ryzen 5000 and 3000 series CPUs with AM4 socket
  • Ultrafast storage via dual M.2 slots supporting PCIe 4.0 and SATA modes
  • Built-in 802.11ac Wi-Fi and USB 3.2 Gen 2 Type-A for quick connections
  • Aura Sync RGB lighting synchronises effects across compatible components
  • 128 GB DDR4 capacity across four slots with XMP 2.0 profiles

AM4 socket for Ryzen 5000 and 3000 Series

The ASUS PRIME B550M-A AC is a micro-ATX motherboard built around the AMD B550 chipset and AM4 socket. It supports Ryzen 5000 Series, 5000 G-Series, 4000 G-Series and 3000 Series desktop processors. The board includes integrated 802.11ac Wi-Fi and Aura Sync RGB lighting for system coordination.

DDR4 memory up to 128 GB capacity

Four 288-pin DDR4 slots accept up to 128 GB in dual-channel mode. Supported speeds range from 2133 MT/s to 4866 MT/s when overclocked, with XMP 2.0 profiles available. ECC memory support depends on the installed CPU. The primary M.2 socket handles 2242, 2260, 2280 and 22110 form factors over PCIe 4.0 x4 or SATA.

PCIe 4.0 x16 slot and SATA 6 Gbps limits

A single PCIe 4.0 x16 slot provides high-bandwidth graphics connectivity when paired with a compatible Ryzen processor; a second slot runs at PCIe 3.0 x16. Two PCIe 3.0 x1 slots add expansion room. Four SATA 6 Gbps ports support RAID 0, 1 and 10 arrays. USB 3.2 Gen 2 Type-A ports deliver 10 Gbps peripheral throughput.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $79.99
Cheaper than about 83% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASUS
Model namePRIME B550M-A AC
Processor
ProcessorSupports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series Processors
* Refer to www.asus.com for CPU support list.
CPU socketAM4
ChipsetAMD B550
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryDDR4 4866(OC) / 4800(OC) / 4600(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3400(OC) / 3333(OC) / 3200 / 3000 / 2933 / 2800 / 2666 / 2400 / 2133*
* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types.
Max supported RAM128 GB
Memory channelsDual Channel
Memory profilesIntel XMP 2.0
ECC supportECC Memory (ECC mode) support varies by CPU.
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsAMD 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 5000 G-Series / 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
SATA and RAID support0/1/10
Graphics
Onboard video chipSupported only by CPU with integrated graphic
Audio & video
Audio chipRealtek ALC887/897
Sound channels7.1 Channels*
* A chassis with an HD audio module in the front panel is required to support 7.1-channel audio output.
Connectivity
Ethernet controllerRealtek RTL8111H
Maximum network speed1 Gbit/s
Wi-Fi standardWi-Fi 802.11 a/b/g/n/ac
Bluetooth support5.0
Ports & slots
PCIe 4.0 x16 slots1 x PCI Express 4.0 x16*
* Actual support may vary by CPU.
PCIe 3.0 x16 slots1 x PCI Express 3.0 x16
PCIe x16 slotsNone
PCIe x1 slots2 x PCIe 3.0 x1
HDMI ports1 x HDMI
USB 3.0 ports2 x USB 3.0
Onboard USB headers1 x USB 3.2 Gen 1 (up to 5 Gbit/s) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s)
2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
Power
Power connectors1 × 24-pin EATX Power connector(s)
1 × 8-pin EATX 12 V Power connectors
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.26 kg
Package size275 × 266 × 68 mm
In the box
In the boxAccessories:
I/O Shield
2 x SATA 6Gb/s cable(s)
1 x Supporting DVD
User manual
1 x Wi-Fi moving antenna
1 x M.2 SSD screw package(s)
More details
LightingRGB

Questions about this item

Will my existing DDR4 memory kits work with the four 288-pin slots on this board?

The board accepts DDR4 modules up to 128 GB total across four slots; supported speeds range from 2133 to 4866(OC) depending on the installed CPU.

How can I confirm the PCIe 4.0 x16 slot and dual M.2 sockets are active after assembly?

Enter the UEFI BIOS and verify the primary x16 slot reports Gen 4.0 and both M.2 sockets show PCIe 4.0 x4 or SATA mode as detected.

Does the package include Wi-Fi antennas and SATA cables, or must I buy them separately?

The retail box ships with the motherboard, I/O shield, Wi-Fi antennas, SATA 6 Gb/s cables and documentation; no extra cables are required for basic installation.

More in Motherboards for AMD CPUs

Similar items