ASUS Prime series is expertly engineered to unleash the full potential of 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series AMD Ryzen platform. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, Prime B550 series motherboards provide daily users and DIY PC builders a range of performance tuning options via intuitive software and firmware features.
Tune It Your Way
Comprehensive controls form the foundation of the ASUS Prime series. The Prime B550 motherboard packs flexible tools to tune every aspect of your system, enabling you to tweak performance settings to perfectly match the way you work – maximizing your productivity.
Cool to the Core
Prime B550 series is engineered with multiple onboard heatsinks and an array of hybrid fan headers to ensure your rig stays cool and stable under intense workloads.
Build on a Solid Foundation
Prime B550 motherboard provides all the fundamentals to boost daily productivity, so your system will be ready for action with stable power, intuitive cooling and flexible transfer options.
Little Things Make a Big Difference
Prime B550 series adds the nuanced details that improve every experience, from exclusive codecs that provide pristine audio quality to intuitive RGB lighting controls that let you customize your system to create a uniquely personal look.
Main Features
AMD AM4 Socket: Ready for Ryzen 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors
Comprehensive Cooling: VRM heatsink, PCH heatsink, hybrid fan headers, and Fan Xpert 2+ utility
Ultrafast Connectivity: Dual M.2, PCIe 4.0, Wi-Fi 6, 1 Gb Ethernet, USB 3.2 Gen 2 Type-A support
Aura Sync RGB Lighting: Onboard addressable Gen 2 header and RGB headers for RGB LED strips, easily synced with Aura Sync-capable hardware

CPU
CPU Socket Socket AM4
CPU Brand AMD
Installed Processors (Max) 0 (1)
Supported Processor Manufacturer AMD
Supported Processors AMD Ryzen 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors
64-bit Support Yes
Socket AM4
Rear Panel I/O Ports
USB Ports 2 x USB 3.1
4 x USB 3.0
HDMI Port 1 x HDMI 2.1
VGA Port 1 x D-Sub
Keyboard/Mouse Combo Port 1 x PS/2
RJ-45 Ports 1 x RJ-45
Digital Port 1 x DVI-D
Audio Line In Ports 1 x 3.5mm Jack
Audio Line Out Ports 1 x 3.5mm Jack
Microphone In Port 1 x 3.5mm Jack
Antenna Connector(s) 2 x SMA Antenna
Internal I/O Connectors
SATA Connectors 4 x SATA III
USB Connectors 1 x USB 3.0 header (supports 2 ports)
2 x USB 2.0 headers (supports 4 ports)
Speaker 1 x Speaker header
Front Panel Connectors 1 x Front Panel
1 x Front Audio
Cooling Fan Support 1 x CPU fan header
1 x CPU OPT fan header
2 x Chassis fan headers
Serial Connectors 1 x COM header
TPM Header 1 x SPI TPM header
Power Connector Port 1 x 24-pin ATX
1 x 8-pin EPS
Other Connectors 1 x M.2 slot, Key M, Type 2242/2260/2280/22110 (PCIe Gen4 or SATA)
1 x M.2 slot, Key M, Type 2242/2260/2280/22110 (PCIe Gen3 or SATA)
1 x M.2 slot, Key M, Type 2242/2260/2280 (PCIe Gen3 or SATA)
1 x 3-pin ARGB LED headers
2 x 4-pin RGB LED headers
Memory
Memory Bus Speed Up to 4866 MHz
Memory Type DDR4
Maximum RAM 128 GB
Memory Slot 4 x DIMM
Motherboard
Northbridge AMD B550
RAID Supported Yes
RAID Format RAID 0, 1, 10
SATA Supported Yes
Expansion
Number of PCI Express Slots 1 x PCI Express 4.0 x16 slot
2 x PCI Express 3.0 x1 slots
Graphics Device
Integrated Graphics Supported Yes
Sound
Integrated Sound Realtek
Warranty
Warranty 3 Years
Network
Integrated Network Realtek
Network Speeds Supported Up to 1 Gbps
Wireless LAN Yes (Wi-Fi 6)
Bluetooth Yes
Bluetooth Version 5.2
System Requirements
Operating Systems Supported Microsoft Windows 11 / 10 64-bit
System
Jumpers 1 x Clear CMOS
Software Included (may be trial or restricted) Yes
Drivers Yes
Physical
Form Factor mATX Motherboard
In The Box Motherboard
2 x SATA Cables
ASUS Wi-Fi Moving Antennas
I/O Shield
M.2 SSD Screw Package
Support DVD
User Manual
Width 244 mm
Length 244 mm
Key Features
Firewire
IDE/EIDE Supported
SCSI/SAS Supported
Wireless Network Yes
Chipset Manufacturer AMD
Number of PCI Slots slot(s)
Number of PCI-X Slots slot(s)
Main Colour
Socket(s)
Memory Channel Dual
On-board Audio Type 7.1
Number of SATA Ports 4 port(s)
Number of USB Ports 6 port(s)
SATA III Support Yes
USB 3.0 Support Yes
Multi GPU Support No
VGA Connection Yes
DVI Connection Yes
HDMI Connection Yes
DisplayPort Connection No
Motherboard Form Factor mATX
Wake on LAN
Motherboard Power Connectors 4 + 4-Pin
Motherboard Chipset AMD B550
Thunderbolt No
Motherboard Model ASUS Prime B550M-A WIFI II
WiFi Speed 2400 Mbps
USB 3.1 Support Yes
Internal USB3.0 Header Yes
Cooler Height mm
M.2 Support Yes
On-board RGB Control ASUS Aura Sync
Memory Speed 4866 MHz
Skip Audio Test
RGB Header Type 3-Pin ARGB
Addressable RGB Yes
Internal USB Type-C Header No
Radiator Length mm
Microsoft Processor List
Power Requirement (auto) 60 W
Cooler count
Max Memory Speed Supported (Non-overclocked) 3200 MHz
Max Memory Speed Supported (overclocked) 4866 MHz
CPU Power Pins (female) 8
PCI Express Power Pins (female)
Total M.2 Slots 2
Maximum NVMe M.2 ports 2
Maximum SATA M.2 ports 2
PCI-e slots
SATA ports 4
No. of front USB2.0 ports supported 4
No. of front USB3.0 ports supported 2
Graphics
Graphics Chipset