Asrock · MPN: 90-MXBR80-A0UAYZ
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Price drop alert

Asrock B850M Pro-A AMD B850 Socket AM5 micro ATX
Now £110.99

We'll email you if the price of this item drops in the next 90 days.

Overview

  • Supports AMD Socket AM5 Ryzen™ 9000, 8000 and 7000 Series Processors
  • 8+2+1 Phase Power Design, Dr.MOS for VCore+SOC+MISC
  • 4 x DDR5 DIMMs, Supports Dual Channel, up to 8000+ (OC)
  • 1 PCIe 5.0 x16, 1 PCIe 4.0 x4
  • Graphics Output Options: 1 HDMI, 1 DisplayPort
  • Realtek ALC897 7.1 CH HD Audio Codec
  • 1 Blazing M.2 (PCIe Gen5x4), 2 Hyper M.2 (PCIe Gen4x4), 4 SATA3
  • 1 USB 3.2 Gen2 Type-C (Rear), 1 USB 3.2 Gen2 Type-A (Rear), 1 USB 3.2 Gen1 Type-C (Front), 6 USB 3.2 Gen1 (2 Rear, 4 Front), 8 USB 2.0 (4 Rear, 4 Front)
  • Realtek 2.5G LAN
  • Supports BIOS Flashback

Optimized for stability, durability, and efficiency. It combines reliable performance, user-friendly features and streamlined style for daily computing tasks.

Optimized VRM Design
8+2+1 Power Phase Design

Featuring sturdy components and completely smooth power delivery to the CPU, offering enhanced performance for gamers.

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.

Power Connector
Hi-Density Power Connector

CPU overclocking requires higher current. ASRock Hi-Density Power Connectors are designed to withstand higher currents compared to traditional CPU and ATX power connectors, providing a more stable system and reducing the risk of fire during heavy overclocking.

6 Layer PCB
The 6 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.

High Speed M.2 Solution
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.

Hyper M.2 Gen4 x4
Supports PCI Express 4.0 M.2 SSDs, it is capable of perform twice the speed compared to previous 3rd generation, giving a lightning fast data transferring experience.

Cooling
Intelligent Cooling Design
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.

PWM/DC Fan Support
ASRock fan headers automatically detect whether fans are running in DC or PWM mode, allowing users to fine-tune the fan curve and achieve quieter operation.

Fan-Tastic Tuning
ASRock A-Tuning Fan-Tastic Tuning function enables users to auto-detect the minimum duty of each fan with a single click. Users can also easily adjust the fan curve via the visualized UI interface, meeting their system's cooling performance and noise reduction requirements.

Connectivity
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.

Stylish Design
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.

DIY Friendly
Dual Graphics Outputs

Complete with two types of most used connectors! Packed with a HDMI + DisplayPort combo, you have more graphics output options now.

Reinforced Steel Slot [PCIe 5.0 Version]
The reinforced steel slot is capable of supporting PCI Express 5.0 standard. The various benefits include:
- Extra anchor points
- Stronger latch
- Ensure signal stability
- Make sure heavy graphics cards to be well-installed.

EZ Setting
Auto Driver Installer

No need to worry about lack of disk drive! Asrock preinstall LAN driver to ensure that you are able to install all drivers needed in an easier way than using SCD.

BIOS Flashback
Get the most convenient BIOS flashing with just a simple click. Users can easily achieve the latest BIOS support with a USB and a power supply. No CPU, RAM or other components are required.

Specifications

Processor

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

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 75 specificationsShow fewer specifications

Storage controllers

Supported storage drive typesHDD & SSD
Supported storage drive interfacesPCI Express 4.0, PCI Express 5.0, SATA III
Number of storage drives supported7
RAID supportYes
RAID levels0, 1, 10

Graphics

Parallel processing technology supportNot supported
Maximum resolution3840 x 2160 pixels
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)1
12V power connectorYes
TPM connectorYes
RGB LED pin headerYes
Number of RGB LED pin headers1

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
HDMI version2.1
DisplayPorts quantity1
DisplayPort version1.4
Line-inYes
Headphone outputs3
Microphone inYes
USB connector typeUSB Type-A, USB Type-C

Network

Ethernet LANYes
Ethernet interface type2.5 Gigabit Ethernet
LAN controllerDragon RTL8125BG
Wi-FiNo
Top Wi-Fi standardNot available

Features

Component forPC
Motherboard form factormicro ATX
Motherboard chipset familyAMD
Motherboard chipsetAMD B850
Audio chipRealtek ALC897
Audio output channels7.1 channels
Product colourBlack
Windows operating systems supportedWindows 10 x64, Windows 11 x64
CertificationFCC, CE, ErP/EuP

Expansion slots

PCI Express x4 (Gen 4.x) slots1
PCI Express x16 (Gen 5.x) slots1
Number of M.2 (M) slots3
1st M.2 largest key size2280
1st M.2 highest PCI Express generation5.0
2nd M.2 largest key size2280
2nd M.2 highest PCI Express generation4.0
3rd M.2 largest key size2280
3rd M.2 highest PCI Express generation4.0

BIOS

BIOS typeUEFI AMI
BIOS memory size256 Mbit

Weight & dimensions

Width244 mm
Depth244 mm

Packaging content

Screws 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