Asrock B850M Pro RS AM5 micro ATX

£113.72 inc VAT

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About This Item

  • AMD B850 chipset with Socket AM5 for Ryzen 7000/8000/9000 CPUs
  • Micro ATX form factor with 4 DIMM DDR5 slots supporting up to 256GB
  • 3 M.2 slots (1x PCIe 5.0, 2x PCIe 4.0) plus 4 SATA III ports
  • 8+2+1 power phase design with Dr. MOS for enhanced CPU performance
  • 2.5Gb LAN, 7.1 audio, HDMI 2.1, DisplayPort 1.4, USB Type-A/C

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Description

ASRock B850M Pro RS | AMD B850 micro ATX Motherboard

The Asrock B850M Pro RS AMD B850 Socket AM5 micro ATX motherboard delivers robust performance for AMD Ryzen 7000/8000/9000 Series processors. This micro ATX board combines reliable power delivery, comprehensive connectivity, and user-friendly features in a compact form factor ideal for mainstream and enthusiast builds.

Slim Specs Table

Metric Spec
Form Factor micro ATX (244 x 244 mm)
Socket Socket AM5
Memory Support DDR5, up to 256GB
PCIe Slots 1x PCIe 5.0 x16, 1x PCIe 4.0 x4
LAN 2.5Gb Ethernet

Optimized Power Delivery for Stable Performance

The B850M Pro RS features an 8+2+1 power phase design with Dr. MOS technology, delivering clean, stable power to your CPU even under heavy loads. The Hi-Density Power Connectors are engineered to handle higher currents than standard connectors, reducing the risk of overheating during intensive overclocking sessions. This robust power delivery system ensures your AMD Ryzen processor performs consistently whether you’re gaming, streaming, or tackling demanding productivity tasks.

High-Speed Storage and Memory Solutions

This motherboard supports the latest storage technologies with three M.2 slots – one PCIe 5.0 capable for next-generation SSDs offering up to 128GB/s transfer speeds, and two PCIe 4.0 slots for high-performance storage options. The 6-layer PCB design provides superior signal integrity and thermal management, allowing for stable memory overclocking with DDR5 modules up to 256GB. ASRock’s XMP/EXPO support makes memory tuning straightforward with pre-tested profiles that unlock your RAM’s full potential without complex manual adjustments.

Intelligent Cooling and DIY-Friendly Design

Efficient thermal management comes from the aluminum heatsink design that effectively dissipates heat from critical components. The motherboard includes comprehensive fan support with PWM/DC detection, allowing automatic adjustment of fan curves for optimal cooling and noise reduction. ASRock’s Fan-Tastic Tuning feature simplifies setup by automatically detecting minimum fan duty cycles. The reinforced PCIe 5.0 steel slot provides extra security for heavy graphics cards, while the pre-installed I/O shield and EZ Setting utilities make assembly straightforward even for first-time builders.

Box contents

  • ASRock B850M Pro RS motherboard
  • SATA cables
  • Screws
  • I/O shield (pre-installed)

Check before you buy

  • Confirm your AMD Ryzen processor is compatible with Socket AM5
  • Verify your case supports micro ATX form factor (244 x 244 mm)
  • Check that your DDR5 memory modules are compatible with this board
  • Confirm you have adequate cooling for your specific CPU and usage scenario

Frequently Asked Questions

Q: Does this motherboard support Wi-Fi?

A: No, the B850M Pro RS does not include built-in Wi-Fi. It features 2.5Gb Ethernet for wired connectivity.

Q: What graphics outputs are available?

A: The motherboard provides one HDMI 2.1 port and one DisplayPort 1.4 for flexible multi-monitor setups.

Q: Can I use ECC memory with this motherboard?

A: Yes, the B850M Pro RS supports both ECC and non-ECC DDR5 memory modules.

Q: How many M.2 SSDs can I install?

A: You can install up to three M.2 SSDs – one PCIe 5.0 and two PCIe 4.0 drives.

Q: What RAID configurations are supported?

A: The motherboard supports RAID 0, RAID 1, and RAID 10 configurations for both SATA and M.2 storage.

The Consultant’s verdict & warranty

The Asrock B850M Pro RS AMD B850 Socket AM5 micro ATX motherboard offers excellent value for users building systems with AMD’s latest Ryzen processors. Its combination of robust power delivery, high-speed storage options, and comprehensive connectivity makes it suitable for both gaming and productivity applications. The compact micro ATX form factor provides flexibility for various case sizes while maintaining feature parity with larger boards. Covered by the standard Manufacturer Warranty.

Specifications
Internal I/O
Number of M.2 (M) slots3
12V power connectorYes
Supported storage drive interfacesPCI Express 4.0, PCI Express 5.0, SATA III
USB 2.0 connectors2
USB 3.2 Gen 1 (3.1 Gen 1) connectors3
TPM connectorYes
Number of SATA III connectors4
Number of chassis fan connectors3
Front panel audio connectorYes
EPS power connector (8-pin)Yes
CPU fan connectorYes
ATX Power connector (24-pin)Yes
RGB LED pin headerYes
Number of CPU fan connectors2
Number of EPS power connectors (8-pin)1
Number of RGB LED pin headers1
Technical details
Motherboard chipset familyAMD
Motherboard chipsetAMD B850
Supported processor socketsSocket AM5
Parallel processing technology supportNot supported
HDMI version2.1
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 B850
RAID levels0, 1, 10
Supported processor socketsSocket AM5
CertificationFCC, CE, ErP/EuP
Audio output channels7.1 channels
Motherboard form factormicro ATX
Component forPC
Processor
Processor manufacturerAMD
Compatible processor seriesAMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported processor socketsSocket AM5
Processor socketSocket AM5
Memory
Number of memory slots4
Memory slots typeDIMM
Supported memory typesDDR5-SDRAM
Memory channelsDual-channel
Maximum internal memory256 GB
Unbuffered memoryYes
ECC сompatibilityECC & Non-ECC
Storage controllers
Supported storage drive typesHDD & SSD
Supported storage drive interfacesPCI Express 4.0, PCI Express 5.0, SATA III
RAID levels0, 1, 10
Number of storage drives supported7
RAID supportYes
Graphics
Parallel processing technology supportNot supported
Maximum resolution3840 x 2160 pixels
HDCPYes
Rear panel I/O ports
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
DisplayPort version1.4
USB connector typeUSB Type-A, USB Type-C
USB 2.0 ports quantity4
Microphone inYes
Headphone outputs3
HDMI version2.1
HDMI ports quantity1
Ethernet LAN (RJ-45) ports1
DisplayPorts quantity1
Line-inYes
Network
Ethernet LANYes
Wi-FiNo
LAN controllerDragon RTL8125BG
Ethernet interface type2.5 Gigabit Ethernet
Features
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Motherboard chipset familyAMD
Motherboard chipsetAMD B850
Supported processor socketsSocket AM5
CertificationFCC, CE, ErP/EuP
Audio output channels7.1 channels
Motherboard form factormicro ATX
Component forPC
Audio chipRealtek ALC897
Product colourBlack
Expansion slots
Number of M.2 (M) slots3
PCI Express x16 (Gen 5.x) slots1
PCI Express x4 (Gen 4.x) slots1
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
Video
Maximum resolution3840 x 2160 pixels
HDCPYes
Certificates
CertificationFCC, CE, ErP/EuP
Software
Windows operating systems supportedWindows 10 x64, Windows 11 x64
Weight & dimensions
Width244 mm
Depth244 mm
Packaging content
Cables includedSATA
Screws includedYes

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