ASRock B850 Steel Legend WiFi (90-MXBQS-A0UAYZ)

Name: ASRock B850 Steel Legend WiFi 90-MXBQS-A0UAYZ
Brand: ASRock

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ASRock B850 Steel Legend WiFi

2025 Steel Legend Wi-Fi M.2 cooling backlight White Edition 2.5 Gbps

Towards:home / office

Form Factor:ATX

Socket:AM5

Chipset:AMD B850

BIOS:Ami

RAM slots:DDR5 4 sl

RAM form factor:DIMM

RAM clock:8000 MHz

Sound (channels):7.1

Connectors:HDMI, M.2

Power connector:24-pin

Processor power:8+8-pin

All specifications

Specifications B850 Steel Legend WiFi

Main
Features	for home/office
Socket	AM5
Form factor	ATX
Power phases	17 / 14+2+1 /
VRM heatsink
LED lighting
Lighting sync	ASRock Polychrome Sync
Size (HxW)	305x244 mm


Chipset
Chipset	AMD B850
BIOS	Ami
UEFI BIOS


RAM
DDR5	4 slot(s)
Memory module	DIMM
Operation mode	2 channel
Max. clock frequency	8000 MHz
Max. memory	256 GB
XMP
EXPO support


Drive interface
SATA 3 (6Gbps)	4
M.2 connector	4
M.2	4xPCIe 4x
M.2 version	1x5.0, 3x4.0
M.2 SSD cooling
Integrated RAID controller


Expansion slots
PCIe 16x slots	2 pcs
PCIe modes	16x/4x
PCIe support	5.0
Steel PCIe connectors

Internal connections
TPM connector
USB-A 2.0	2 pcs
USB-A 5Gbps	2 pcs
USB-C 20Gbps	1 pcs
ARGB LED strip	3


Video outputs
HDMI output
HDMI version	v2.1


Integrated audio
Audiochip	Realtek ALC4082
Sound (channels)	7.1
Optical S/PDIF


Network interfaces
Wi-Fi	Wi-Fi 7 (802.11be)
Bluetooth	Bluetooth v5.4
LAN (RJ-45)	2.5 Gbps
LAN ports	1
LAN controller	Dragon RTL8125BG


External connections
USB-A 2.0	4 pcs
USB-A 5Gbps	3 pcs
USB-A 10Gbps	2 pcs
USB-C 10Gbps	2 pcs
BIOS FlashBack


Power connectors
Main power socket	24-pin
CPU power	8+8-pin
Fan power connectors	6
CPU Fan 4-pin	2
CPU/Water Pump Fan 4-pin	1
Chassis/Water Pump Fan 4-pin	3


Official Website	asrock.com
Added to E-Catalog	January 2025
P/N	90-MXBQS-A0UAYZ

E-Catalog UK editor, Motherboards

Valerii Lenko, edited 10.11.2025

The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
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