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ASUS PRIME B850-PLUS-CSM - motherboard - ATX - Socket AM5 - AMD B850

Name: ASUS PRIME B850-PLUS-CSM motherboard ATX Socket AM5 AMD B850
Brand: ASUS
SKU: 90MB1LC0-M0EAYC
Price: 177.12 GBP
Availability: InStock

Manuf P/N: 90MB1LC0-M0EAYC

APAXON#: 11808591

EAN: 4711387982037

ASUS PRIME B850-PLUS-CSM
Motherboard
ATX
Socket AM5
AMD B850 Chipset
USB-C 3.2 Gen2, USB 3.2 Gen 2, USB 3.2 Gen 1, USB-C 3.2 Gen 1
2.5 Gigabit LAN
onboard graphics (CPU required)
HD Audio (8-channel)
Weight: 1.56 KG

Supports AMD Ryzen 7000/8000/9000 Series processors
4 DIMM slots with DDR5 support for high-speed memory
Multiple USB connectivity options including USB-C
Integrated 2.5 Gigabit Ethernet for fast networking
Cooling features for sustained performance

Stock55

ConditionNew

Exc. VAT

£147.60

Inc. VAT £177.12

Quantity

Notify me when available

Sales & Technical

Phone: 0161 464 9941

Email: sales@apaxon.co.uk

Manufacturer Warranty

Manufacturer warranty applies. Warranty periods and service levels vary by brand and product type.

Apaxon® is an authorised reseller of Asus. Warranty claims, repairs, replacements, and credits are fulfilled strictly in accordance with the manufacturer's terms and conditions.

Returns Policy

Business & Consumer Purchases

Orders placed for business use, resale, or onward supply are treated as Business-to-Business (B2B) transactions. B2B sales do not carry an automatic right of cancellation.

Nothing in this policy affects statutory consumer rights under UK law.

Consumer Cancellation (B2C Only)

Consumers may cancel within 14 days of delivery under the Consumer Contracts Regulations 2013.
Cancellation must be confirmed in writing within 14 days of delivery.
Goods must be returned within 14 days of cancellation.
Items must be unused beyond reasonable inspection and in resaleable condition.
Return shipping costs are the customer's responsibility.
Prepaid return labels are not provided for change-of-mind returns.
Refunds are processed after inspection and issued to the original payment method.

Faults & Delivery Issues

Transit damage or shortages must be reported within 48 hours of delivery.
Visible defects must be reported within 7 days of delivery.
Hidden faults must be reported within 7 days of discovery.
Returns require prior authorisation and a valid RMA reference.
Failure to report within these timeframes may affect eligibility for return or claim.

Business Returns (B2B)

Business customers do not have an automatic right to return non-faulty goods.

Supply chain authorisation
Restocking fees (typically 15–25%)
Inspection approval
Non-refundable outbound carriage

Return shipping is the responsibility of the buyer unless agreed otherwise.

Non-Returnable Items

Software, licences, activation keys, and digital products
Special-order or non-standard procurement items
Opened consumables
Items not in resaleable condition

Overview

The ASUS PRIME B850-PLUS-CSM is a versatile motherboard designed for high-performance computing. This ATX form factor board supports the AMD B850 chipset and is compatible with Ryzen 7000/8000/9000 Series processors, allowing for advanced processing capabilities. It features 4 DIMM slots supporting DDR5 SDRAM at speeds of up to 4000 MHz (O.C.), ensuring ample room for memory expansion and efficient operation. Equipped with multiple USB interfaces, including USB 3.2 Gen 2 and USB-C options, the motherboard ensures swift data transfer and connectivity for various peripherals. The integrated 2.5 Gigabit Ethernet provides enhanced networking capabilities, making it suitable for casual users and gamers. With its cooling features, including an M.2 heatsink and VRM heatsink design, the ASUS PRIME B850-PLUS-CSM enables optimal thermal performance during intense tasks, offering a reliable foundation for any build.

Main Specifications

Product Description: ASUS PRIME B850-PLUS-CSM - motherboard - ATX - Socket AM5 - AMD B850
Product Type: Motherboard - ATX
Chipset Type: AMD B850
Processor Socket: 1 x Socket AM5
Compatible Processors: Ryzen (supports Ryzen 7000/8000/9000 Series)
Max RAM Size: 256 GB
RAM Supported: 4 DIMM slots - DDR5, non-ECC, on-die ECC, unbuffered
Storage Ports: 4 x SATA-600 (RAID), 3 x M.2
USB / FireWire Ports: 1 x USB-C 3.2 Gen 2 + 3 x USB 3.2 Gen 2 + 2 x USB 3.2 Gen 1 + 2 x USB 2.0 + (1 x USB4 + 1 x USB-C 3.2 Gen 1 + 2 x USB 3.2 Gen 1 + 6 x USB 2.0 via headers)
Audio: HD Audio (8-channel)
LAN: 2.5 Gigabit Ethernet

Associated Documents

APAXON Product Data Sheet - ASUS PRIME B850-PLUS-CSM - motherboard - ATX - Socket AM5 - AMD B850(90MB1LC0-M0EAYC).pdfPDF

Product Features

Robust connectivity options

The motherboard features multiple expansion slots, including PCIe 5. 0 x16 and a variety of USB ports, providing options for connecting additional hardware and peripherals.

Efficient thermal management

With specialized elements like an M. 2 heatsink and VRM heatsink design, the motherboard helps maintain optimal temperatures even during demanding tasks, promoting system longevity.

Advanced audio capabilities

The onboard audio system supports high definition audio output with 8-channel capability, ensuring immersive sound quality for gaming and media consumption.

User-friendly BIOS features

The AMI BIOS includes helpful utilities such as ASUS EZ Flash 3 and CrashFree BIOS 3, simplifying system management and recovery.

Networking flexibility

Equipped with 2. 5 Gigabit Ethernet and Bluetooth, this motherboard supports high-speed wired connections along with versatile wireless options for seamless online experiences.

What's in the box

ASUS PRIME B850-PLUS-CSM 2 x Serial ATA cable, 1 x M.2 rubber package, 3 x M.2 SSD screw package, Software

Specifications

General

Max Processors Qty: 1
Product Type: Motherboard - ATX
Processor Socket: Socket AM5
Compatible Processors: Ryzen (supports Ryzen 7000/8000/9000 Series)
Chipset Type: AMD B850

Connections & Expansion

Storage Interfaces: SATA-600 -connectors: 4 x 7pin Serial ATA - RAID 0 / RAID 1 / RAID 10 / RAID 5, PCIe 5.0 -connectors: 1 x M.2 - RAID 0 / RAID 1 / RAID 10 / RAID 5, PCIe 4.0 -connectors: 2 x M.2 - RAID 0 / RAID 1 / RAID 10 / RAID 5ID 0 / RAID 1 / RAID 10 / RAID 5
Internal Interfaces: 6 x USB 2.0 - header, 2 x USB 3.2 Gen 1 - header, 1 x USB-C 3.2 Gen 1 - header, 1 x audio - header, 1 x serial - header, 1 x Thunderbolt 4 - header, 1 x SPDIF out - header, 1 x SPI - header
Expansion Slots: 1 x CPU, 4 x DIMM 288-pin, 1 x PCIe 5.0 x16, 1 x PCIe 4.0 x16 (x4 mode), 2 x M.2 socket (2280 M.2 Key M slot), 1 x M.2 socket (2242/2260/2280/22110 M.2 Key M slot)
Interfaces: 1 x USB-C 3.2 Gen 2, 3 x USB 3.2 Gen 2, 2 x USB 3.2 Gen 1, 2 x USB 2.0, 1 x DisplayPort, 1 x HDMI, 2 x aerial, 1 x LAN (2.5Gigabit Ethernet), 1 x microphone - mini-jack, 1 x audio line-out - mini-jack, 1 x audio line-in - mini-jack
Power Connectors: 24-pin main power connector, 4-pin ATX12V connector, 8-pin ATX12V connector
RAID Features: AMD RAID Xpert2 Technology

Miscellaneous

Width: 30.5 cm
Depth: 24.4 cm
Cables Included: 2 x Serial ATA cable
Included Accessories: 1 x M.2 rubber package, 3 x M.2 SSD screw package
Software Included: Armoury Crate, Adobe Creative Cloud (free trial), ASUS AI Advisor, ASUS AURA Creator, ASUS CPU-Z, ASUS DriverHub, ASUS Fan Xpert 2+, ASUS GlideX, Norton 360 Deluxe (60 days trial), TurboV Core, WinRAR (40 days trial)

Audio

Compliant Standards: High Definition Audio
Type: HD Audio (8-channel)

Features

BIOS Type: AMI
Sleep / Wake Up: Wake on LAN (WOL), wake on PME
BIOS Features: UEFI BIOS, ASUS EZ Flash 3, ASUS UEFI BIOS EZ Mode
Hardware Features: Preboot eXecution Environment (PXE), CrashFree BIOS 3, ASUS 5X Protection III, ASUS Aura Sync, ASUS DIGI+ VRM, ASUS EZ DIY, ASUS Overvoltage Protection, ASUS Q-Design, ASUS SafeSlot, ASUS Stainless Steel Back I/O, BIOS FlashBack button, BIOS FlashBack LED, LANGuard, M.2 heatsink, pre-mounted I/O shield, Q-Antenna, Q-Dashboard, Q-DIMM, Q-LED Core, Q-Slot, VRM heatsink design, 8+2+1 Phase Power Design, ASUS Enhanced Memory Profile (AEMP), chipset heatsink, 6 Layer PCB

LAN

Network Interfaces: 2.5 Gigabit Ethernet

Supported RAM

Registered or Buffered: Unbuffered
Max Size: 256 GB
Technology: DDR5
Features: AMD EXPO technology, dual channel memory architecture
Supported RAM Integrity Check: Non-ECC, on-die ECC
Bus Clock: 8000 MT/s (O.C.)

ASUS PRIME B850-PLUS-CSM - motherboard - ATX - Socket AM5 - AMD B850 — image 1

Customer Reviews

“delivery was very quick and laptop was exactly what was advertised”

Reviews are independently collected and not edited by Apaxon®.

“Bought for my office, came new as expected and item is as described. Love it”

Reviews are independently collected and not edited by Apaxon®.

“did the job exactly what was advertised, would highly recommend”

Reviews are independently collected and not edited by Apaxon®.

What our clients say

Verified customer reviews

Collected independently on VouchRate

★★★★★

Kaydron is excellent!

Really starting to transform my business to where I want it to be 😄

Apaxon replied: Thank you so much for the fantastic review! 😄 It’s been a pleasure working with you and seeing the business take shape. I’m really glad we’re helping move things in the direction you’ve been aiming for, and there’s plenty more to come! Thanks again for your trust and support — it’s genuinely appreciated! — Kadron

Chris · 12 September 2026

★★★★★Verified purchase

Efficient and reliable

Purchased an Apple product, was cautious initially as not used this site before but it arrived the next day even though courier left it on door step. will definitely recommend Apaxon!

Apaxon replied: Thank you so much for your review! We completely understand being cautious when trying a new website, so it’s great to hear that we could make a good first impression. We’re delighted your Apple product arrived the next day and that you were happy with the service. We really appreciate your recommendation and hope to welcome you back to Apaxon again soon! 😊

Lorraine Johnson · 5 September 2026

★★★★★

Great Company to deal with.

Great job by Kadron and the team. Definitely recommend for IT services

Apaxon replied: Thank you for the fantastic review! It’s been a pleasure supporting Mitsiland. We really appreciate your trust in us and are always happy to help keep everything running smoothly. We look forward to continuing to support you and the team! 👍

Mitsiland · 4 September 2026

★★★★★Verified purchase

Brilliant company

Apaxon Limited provide an excellent service to my business. Very knowledgeable and always responsive. Any IT issue that arises is always swiftly solved by the team at Apaxon

Apaxon replied: Thank you for this thoughtful review :-)

Suzanne Sill · 1 September 2026

MitsilandPremium Automotive Service & Repair Specialist

Apaxon®'s IT solutions have optimised our operations and significantly boosted our productivity. The team's reliable support and expertise have been genuinely invaluable to our business.

Managed IT★★★★★

Floor AngelsProfessional Cleaning Services

Apaxon®'s support has been excellent across every interaction. Their responsiveness and attention to detail make our daily operations much easier and more reliable to manage.

IT Support★★★★★

Cleaning Angels YorkshireSpecialist Cleaning Services

With Apaxon®'s help, our security posture and operational efficiency have greatly improved. We now have complete confidence in our IT infrastructure and the people behind it.

Cybersecurity★★★★★

Sagars 365Conservatory Roof Insulation

Apaxon®'s customer service has exceeded every expectation. Their prompt, professional support has been crucial for maintaining business continuity and keeping our team productive.

Managed IT★★★★★

Cotswold Magic CarpetsCarpet & Flooring Specialist

I approached Kadron after a friend recommended him, having used him for their own business. I'm so glad I did! 😃 He is simply transforming my business and taking it exactly where it needs to be. He's incredibly patient with me and all of my ideas 😂, really listens to what I want, and somehow manages to bring it all together. I couldn't recommend him highly enough!

via Google

Business IT★★★★★

Geoffs Garden OrnamentsGarden Ornaments & Outdoor Living

Kadron is amazing, he has helped our business and done a full make over on our websites. Kadron has also shared his knowledge and provided the information I need in great detail, is always on standby to assist and is fast at acting upon any tasks I throw at him. It's been a great pleasure, and have built a lovely business relationship for all our needs.

Also for Just Fountainsvia Google

Web Development★★★★★

Thistlemist FarmFarm & Countryside Business

Kadron's service is second to none… I will forever be indebted to him for how he has gone above & beyond to help me with my website & business in general. Thank you Kadron.

via Google

Web Development★★★★★

Testimonials from Apaxon® IT, web and support clients, including verbatim Google reviews. They describe our service, not this product.

Technology Partners

All Verified

Authorised Partner

Lenovo

Tier 2 Partner

Intel

Authorised Partner

Commercial Traditional Dealer

Registered Partner

Infrastructure Partner

Microsoft

Commercial Partner

ASUS PRIME B850-PLUS-CSM - motherboard - ATX - Socket AM5 - AMD B850

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