Asrock · MPN: 90-MXBU20-A0UAYZ
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Overview

  • AMD Socket AM5 AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series
  • PC ATX AMD B850 Realtek ALC897 7.1 channels
  • DDR5-SDRAM 4 DIMM Maximum internal memory: 256 GB
  • M.2, SATA III RAID support Number of storage drives supported: 6
  • BIOS type: UEFI AMI 512 Mbit
  • 2.5 Gigabit Ethernet Wi-Fi Wi-Fi 7 (802.11be) Bluetooth 5.4

Rock Series brings reliable performance and solid quality in a clean, modern design—ready for work, study, and gaming with practical, well-balanced features.

8 Layer PCB
The 8 Layer PCB provides stable signal traces and power shapes delivering lower temperature and higher energy efficiency for memory overclocking! Thus, it's able to support the latest memory modules with most extreme memory performance!

DDR5 XMP & EXPO Support
Derived from the “built for stable and reliable” designing concept, ASRock does not compromise on any details. This motherboard is built with high quality materials, enthusiasts are able to enjoy the boost of DDR5 memory overclocking performance by enabling the pre-tested profiles. Make sure the memory modules are Intel® XMP/AMD EXPO™ capable and overclocking can be made so affordable, satisfying and absolutely no sweat at all.

PCIe Gen5 Blazing M.2
The Blazing M.2 accommodates the latest PCI Express 5.0 standard to perform twice the bandwidth compared to previous generation, with a breathtaking 128Gb/s transfer speed, it is ready to unleash the full potential of future ultrafast SSDs.

Aluminum Heatsink
The first thing that catches the eye is the optimized Aluminum Heatsink Design. Heatsinks are crucial for efficient heat dissipation, especially during heavy workloads like gaming or productivity tasks. Motherboard that built with heatsinks can effectively manage thermal performance, hence ensure system stability and durability effortlessly.

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.

Front USB 3.2 Gen1 Type-C
Front USB 3.2 Gen1 Type-C header delivers up to 5 Gbps data transfer rate and next generation reversible USB design to the front panel of computer case.

POLYCHROME RGB
This motherboard features onboard RGB headers and addressable RGB headers that allow motherboard to be connected to compatible LED devices such as strip, CPU fans, coolers, chassis and so on. Users may also synchronize RGB LED devices across the Polychrome RGB Sync-certified accessories to create their own unique lighting effects.

SignalRGB
SignalRGB unifies your RGB devices, offering seamless customization, game-reactive effects, macro automation, and system monitoring. The official partnership empowers ASRock motherboards with advanced lighting control, enhances compatibility with a diverse range of RGB devices, and provides greater customization flexibility.

64MB BIOS Ready for Future AM5 Processors
64MB BIOS provides expanded firmware capacity to support future AM5 processors, offering long-term compatibility and enhanced update capability.

Specifications

Processor

Processor manufacturerAMD
Processor socketSocket AM5
Compatible processor seriesAMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series

Memory

Supported memory typesDDR5-SDRAM
Number of memory slots4
Memory slots typeDIMM
Memory channelsDual-channel
ECC сompatibilityECC & Non-ECC
Maximum internal memory256 GB
Unbuffered memoryYes
Show all 60 specificationsShow fewer specifications

Storage controllers

Supported storage drive interfacesM.2, SATA III
Number of storage drives supported6
RAID supportYes

Graphics

HDCP version2.3
HDCPYes

Internal I/O

USB 2.0 connectors2
USB 3.2 Gen 1 (3.1 Gen 1) connectors3
Number of SATA III connectors4
Front panel audio connectorYes
ATX Power connector (24-pin)Yes
CPU fan connectorYes
Number of CPU fan connectors2
Number of chassis fan connectors3
EPS power connector (8-pin)Yes
Number of EPS power connectors (8-pin)2
TPM connectorYes
RGB LED pin headerYes

Rear panel I/O ports

USB 2.0 ports quantity4
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity2
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
Ethernet LAN (RJ-45) ports1
HDMI ports quantity1
Line-inYes
Microphone inYes

Network

Ethernet LANYes
Ethernet interface type2.5 Gigabit Ethernet
LAN controllerDragon RTL8125BG
Wi-FiYes
Top Wi-Fi standardWi-Fi 7 (802.11be)
Wi-Fi standards802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 7 (802.11be)
BluetoothYes
Bluetooth version5.4

Features

Component forPC
Motherboard form factorATX
Motherboard chipset familyAMD
Motherboard chipsetAMD B850
Audio chipRealtek ALC897
Audio output channels7.1 channels
Windows operating systems supportedWindows 11 x64, Windows 10 x64

Expansion slots

PCI Express x1 (Gen 4.x) slots2
PCI Express x16 (Gen 4.x) slots1
PCI Express x16 (Gen 5.x) slots1
Number of M.2 (M) slots2

BIOS

BIOS typeUEFI AMI
BIOS memory size512 Mbit

Weight & dimensions

Width305 mm
Depth244 mm

Packaging content

Antenna includedYes
Cables includedSATA

Manuals & downloads

Delivery & returns

Delivery

  • FREE standard delivery on orders over £50, otherwise £4.95 (3–5 working days).
  • Express delivery £9.99 (1–3 working days) on selected products, UK mainland.
  • PlayStation and Arozzi products use a 5–7 working-day service.
  • Orders are processed within 24 hours, Monday to Friday excluding bank holidays. All deliveries must be signed for.

Returns

  • Changed your mind? Tell us within 14 days of receiving your item, then return it within a further 14 days, unused and in its original packaging. A minimum £9.99 collection fee applies.
  • Faulty or damaged on arrival? Contact us within 48 hours of delivery.
  • Custom-built PCs can only be returned if faulty. Opened headphones, earphones and AirPods can't be returned for hygiene reasons.

Full delivery information · Full returns policy