Asrock B550M Steel Legend AMD B550 Socket AM4 micro ATX

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Supports 3rd Gen AMD AM4 Ryzen, 4 x DIMM, DDR4 4733+ (OC), 7.1 CH HD Audio, Dragon 2.5G LAN
SKU
90-MXBCU0-A0UAYZ
UNSPSC: 43201513
Steel Legend represents the philosophical state of rock-solid durability and irresistible aesthetics. Built around most demanding specs and features, the Steel Legend series aims at daily users and mainstream enthusiasts! Providing a strong array of materials/components to ensure a stable and reliable performance.

STEEL FOREVER
Get Endless Performance Possibilities with Steel Style

Nahimic Audio
Whether you are using headphones, a headset, external or internal speakers, via USB, Wi-Fi, analog output or even HDMI, Nahimic Audio offers you the most engaging listening experience, vibrant and rich with details.

The Sound Tracker is a visual indicator that points out the directions from which predominant sounds are coming. Each sound is properly positioned in 360° on a radar for a full immersion during the game.

Dr. MOS
Dr.MOS is the integrated power stage solution which is optimized for synchronous buck-set down voltage applications! Compared to traditional discrete MOSFETs, it intelligently delivers higher current for each phase, thus providing improved thermal result and superior performance.

Premium 60A Power Choke
Compared to traditional chokes, ASRock’s premium 60A power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard.

Hi-Density Power Connector
Reduces 23% power loss and decreases the connector’s temperature by 22 degrees Celsius.
8+4 12V Power Connectors
24-pin ATX Power Connector

2oz Copper PCB
2 ounce copper inner layers that provide stable signal traces and power shapes! Delivering lower temperature and higher energy efficiency for overclocking, it's able to support the latest DDR4 memory modules with most extreme memory performance!

RULE YOUR OWN LIGHTING WAY - POLYCHROME RGB
ASRock motherboards deliver stunning performance and superior aesthetics to rule your own colorful lighting way! ASRock offers a very comprehensive control to perform the built-in RGB LEDs or the connected LED strips, CPU fans, coolers, chassis and any RGB devices smoothly. Devices can be synchronized across the Polychrome RGB Sync-certified accessories as well.

Dragon 2.5 Gb/s LAN
The intelligent 2.5Gb/s LAN platform is built for maximum networking performance for the demanding requirements of home networking, content creators, online gamers and high-quality streaming media. Boost networking performance up to 2.5X the bandwidth compared to the standard gigabit Ethernet, you’ll enjoy the faster and uncompromised connectivity experience for gaming, file transfers and backups.

Automatically detects and accelerates game traffic ahead of other network traffic for smoother, stutter-free in-game performance and the competitive edge.

A SOLID M.2-SOLUTION PERFORMER
Dual M.2 For SSD, Supports Type 22110 M.2
Ready for higher capacity and even faster Type 22110 M.2 NVMe SSD to fulfill the need of performance. Hyper M.2 socket that supports PCIe Gen4 x4 while M.2 socket is capable of running PCIe Gen3 x2 and SATA3 mode.
Internal I/O
Number of M.2 (M) slots2
Number of M.2 (E) slots1
Front panel connectorYes
12V power connectorYes
Supported storage drive interfacesM.2, SATA III
USB 2.0 connectors2
USB 3.2 Gen 1 (3.1 Gen 1) connectors2
TPM connectorYes
Peripheral (Molex) power connectors (4-pin)2
Number of SATA III connectors6
Number of chassis fan connectors4
Front panel audio connectorYes
EPS power connector (8-pin)Yes
CPU fan connectorYes
ATX Power connector (24-pin)Yes
RGB LED pin headerYes
Technical details
Number of displays supported2
Motherboard chipset familyAMD
Motherboard chipsetAMD B550
Supported processor socketsSocket AM4
PC health monitoringCPU, Fan, Temperature, Voltage, Water cooling
Parallel processing technology supportCrossFireX, Quad-GPU CrossFireX
Motherboard form factormicro ATX
Component forPC
Audio
Audio output channels7.1 channels
Performance
Supported storage drive typesHDD & SSD
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Motherboard chipset familyAMD
Motherboard chipsetAMD B550
RAID levels0, 1, 10
Supported processor socketsSocket AM4
PC health monitoringCPU, Fan, Temperature, Voltage, Water cooling
Audio output channels7.1 channels
Motherboard form factormicro ATX
Component forPC
Processor
Processor manufacturerAMD
Compatible processor seriesAMD Ryzen 3000 Series
Supported processor socketsSocket AM4
Maximum number of SMP processors1
Processor socketSocket AM4
Memory
Number of memory slots4
Memory slots typeDIMM
Supported memory typesDDR4-SDRAM
Supported memory clock speeds2133,2400,2667,2933,3200,3333,3466,3600,3733,3800,3866,4000,4133,4200,4266,4333,4400,4466,4533 MHz
Supported memory module capacities4GB, 8GB, 16GB, 32GB
Maximum internal memory128 GB
Unbuffered memoryYes
Supported memory clock speed (max)4533 MHz
Storage controllers
Supported storage drive typesHDD & SSD
Supported storage drive interfacesM.2, SATA III
RAID levels0, 1, 10
RAID supportYes
Graphics
Number of displays supported2
Parallel processing technology supportCrossFireX, Quad-GPU CrossFireX
Maximum resolution5120 x 2880 pixels
HDCPYes
Rear panel I/O ports
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity4
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity1
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity1
DisplayPort version1.4
USB 2.0 ports quantity2
WiFi-AP antenna jack2
S/PDIF out portYes
PS/2 ports quantity1
Microphone inYes
HDMI ports quantity1
Ethernet LAN (RJ-45) ports1
DisplayPorts quantity1
Network
Ethernet LANYes
Wi-FiNo
Wake-on-LAN readyYes
LAN controllerDragon RTL8125BG
Ethernet interface type2.5 Gigabit Ethernet
Features
Power source typeATX
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Motherboard chipset familyAMD
Motherboard chipsetAMD B550
Supported processor socketsSocket AM4
PC health monitoringCPU, Fan, Temperature, Voltage, Water cooling
Audio output channels7.1 channels
Motherboard form factormicro ATX
Component forPC
Audio chipRealtek ALC1200
Harmonized System (HS) code84733020
Expansion slots
Number of M.2 (M) slots2
Number of M.2 (E) slots1
PCI Express x1 (Gen 3.x) slots1
PCI Express x16 (Gen 3.x) slots1
PCI Express x16 (Gen 4.x) slots1
BIOS
BIOS typeUEFI AMI
BIOS memory size256 Mbit
ACPI version5.1
Clear CMOS buttonYes
System Management BIOS (SMBIOS) version2.3
Plug and PlayYes
Power
Power source typeATX
Video
Maximum resolution5120 x 2880 pixels
HDCPYes
Software
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Drivers includedYes
Logistics data
Harmonized System (HS) code84733020
Weight & dimensions
Height70 mm
Weight465 g
Width244 mm
Depth244 mm
Packaging content
Quick installation guideYes
Drivers includedYes
Cables includedSATA
Other features
Number of M.2 (E) slots1
Height70 mm
Weight465 g
Quick installation guideYes
SKU 90-MXBCU0-A0UAYZ
EAN 4710483931505
Specification
Internal I/O
Number of M.2 (M) slots2
Number of M.2 (E) slots1
Front panel connectorYes
12V power connectorYes
Supported storage drive interfacesM.2, SATA III
USB 2.0 connectors2
USB 3.2 Gen 1 (3.1 Gen 1) connectors2
TPM connectorYes
Peripheral (Molex) power connectors (4-pin)2
Number of SATA III connectors6
Number of chassis fan connectors4
Front panel audio connectorYes
EPS power connector (8-pin)Yes
CPU fan connectorYes
ATX Power connector (24-pin)Yes
RGB LED pin headerYes
Technical details
Number of displays supported2
Motherboard chipset familyAMD
Motherboard chipsetAMD B550
Supported processor socketsSocket AM4
PC health monitoringCPU, Fan, Temperature, Voltage, Water cooling
Parallel processing technology supportCrossFireX, Quad-GPU CrossFireX
Motherboard form factormicro ATX
Component forPC
Audio
Audio output channels7.1 channels
Performance
Supported storage drive typesHDD & SSD
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Motherboard chipset familyAMD
Motherboard chipsetAMD B550
RAID levels0, 1, 10
Supported processor socketsSocket AM4
PC health monitoringCPU, Fan, Temperature, Voltage, Water cooling
Audio output channels7.1 channels
Motherboard form factormicro ATX
Component forPC
Processor
Processor manufacturerAMD
Compatible processor seriesAMD Ryzen 3000 Series
Supported processor socketsSocket AM4
Maximum number of SMP processors1
Processor socketSocket AM4
Memory
Number of memory slots4
Memory slots typeDIMM
Supported memory typesDDR4-SDRAM
Supported memory clock speeds2133,2400,2667,2933,3200,3333,3466,3600,3733,3800,3866,4000,4133,4200,4266,4333,4400,4466,4533 MHz
Supported memory module capacities4GB, 8GB, 16GB, 32GB
Maximum internal memory128 GB
Unbuffered memoryYes
Supported memory clock speed (max)4533 MHz
Storage controllers
Supported storage drive typesHDD & SSD
Supported storage drive interfacesM.2, SATA III
RAID levels0, 1, 10
RAID supportYes
Graphics
Number of displays supported2
Parallel processing technology supportCrossFireX, Quad-GPU CrossFireX
Maximum resolution5120 x 2880 pixels
HDCPYes
Rear panel I/O ports
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity4
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity1
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity1
DisplayPort version1.4
USB 2.0 ports quantity2
WiFi-AP antenna jack2
S/PDIF out portYes
PS/2 ports quantity1
Microphone inYes
HDMI ports quantity1
Ethernet LAN (RJ-45) ports1
DisplayPorts quantity1
Network
Ethernet LANYes
Wi-FiNo
Wake-on-LAN readyYes
LAN controllerDragon RTL8125BG
Ethernet interface type2.5 Gigabit Ethernet
Features
Power source typeATX
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Motherboard chipset familyAMD
Motherboard chipsetAMD B550
Supported processor socketsSocket AM4
PC health monitoringCPU, Fan, Temperature, Voltage, Water cooling
Audio output channels7.1 channels
Motherboard form factormicro ATX
Component forPC
Audio chipRealtek ALC1200
Harmonized System (HS) code84733020
Expansion slots
Number of M.2 (M) slots2
Number of M.2 (E) slots1
PCI Express x1 (Gen 3.x) slots1
PCI Express x16 (Gen 3.x) slots1
PCI Express x16 (Gen 4.x) slots1
BIOS
BIOS typeUEFI AMI
BIOS memory size256 Mbit
ACPI version5.1
Clear CMOS buttonYes
System Management BIOS (SMBIOS) version2.3
Plug and PlayYes
Power
Power source typeATX
Video
Maximum resolution5120 x 2880 pixels
HDCPYes
Software
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Drivers includedYes
Logistics data
Harmonized System (HS) code84733020
Weight & dimensions
Height70 mm
Weight465 g
Width244 mm
Depth244 mm
Packaging content
Quick installation guideYes
Drivers includedYes
Cables includedSATA
Other features
Number of M.2 (E) slots1
Height70 mm
Weight465 g
Quick installation guideYes
Manufacturer Asrock
In Stock N