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The ASUS PRIME B850M-K, model 90MB1LV0-M0EAY0, is a micro ATX motherboard built around the AMD B850 chipset and Socket AM5 platform. It supports AMD Ryzen 7000, 8000 and 9000 Series processors, with provision for one CPU. Designed to provide a capable foundation for a modern AMD system, it combines DDR5 memory support, PCIe expansion, M.2 and SATA storage connectivity, integrated networking, eight-channel HD Audio and a broad selection of external and internal interfaces. Onboard display connectivity is also provided for use with a processor that supports graphics output.
Memory support is based on a dual-channel DDR5 architecture with two 288-pin DIMM slots and a maximum supported capacity of 256 GB. Supported memory clocks include 4000 MHz as well as 4100 MHz and 4200 MHz when overclocked. The board supports on-die ECC, non-ECC and ECC memory integrity options, together with AMD EXPO technology. ASUS Enhanced Memory Profile technology is included, with both AEMP and AEMP III among the motherboard's hardware features, while ASUS OptiMem II is incorporated as part of the memory implementation.
Storage options cover both M.2 and conventional SATA drives. Two M.2 sockets are provided, including one 2280 M.2 slot and one M.2 Key M socket supporting 2242, 2260 and 2280 form factors. The storage interfaces comprise one PCIe 5.0 M.2 connection and one PCIe 4.0 M.2 connection, alongside four SATA-600 connectors using 7-pin Serial ATA connections. AMD RAID Xpert2 Technology is supported for RAID functionality and storage management. An M.2 heatsink, M.2 Q-Latch, M.2 screw package and M.2 backplate rubber package are also part of the supplied feature and accessory set.
Expansion capabilities include a PCIe 5.0 x16 slot and a PCIe 4.0 x16 slot operating in x4 mode, allowing the motherboard to accommodate graphics and other compatible expansion hardware. ASUS SafeSlot and Q-Slot features are included, while Q-DIMM, Q-Connector, Q-Code and Q-LED form part of the wider ASUS Q-Design feature set intended to support system assembly, configuration and hardware management.
The PRIME B850M-K provides extensive USB connectivity through both its rear interfaces and internal headers. External connections include two USB 3.2 Gen 2 ports, two USB 3.2 Gen 1 ports and four USB 2.0 ports. Internally, the motherboard provides a USB-C 3.2 Gen 1 header, two USB 3.2 Gen 1 connections through headers and four USB 2.0 connections through headers. Additional internal connections include serial, SPDIF output, SPI and audio headers, giving the board a varied set of options for compatible chassis connections and system hardware.
Display connectivity consists of one HDMI interface and one DisplayPort, with graphics output requiring a suitable CPU with onboard graphics capability. A combined PS/2 keyboard and mouse connection is also available. For wired networking, the motherboard incorporates a 2.5 Gigabit Ethernet interface, while ASUS LANGuard is included among its hardware features. Preboot eXecution Environment, or PXE, support and wake on LAN functionality are also provided, along with wake on PME support.
Audio is handled by an eight-channel HD Audio implementation compliant with the High Definition Audio standard. Rear audio connectivity comprises dedicated mini-jack connections for line output, microphone input and line input. The audio feature set also includes jack detection, jack retasking and an anti-pop function, while an internal audio header and an SPDIF output header provide further connection options.
Power delivery uses a 24-pin main motherboard power connector together with an 8-pin ATX12V connection. The board incorporates an 8+2+1 phase power design and ASUS DIGI+ VRM technology, complemented by a VRM heatsink design. A dedicated Water Pump Header is also included for compatible cooling configurations.
Firmware management is based on an AMI UEFI BIOS and includes ASUS EZ Flash for BIOS updating. BIOS FlashBack functionality is supported through a dedicated BIOS FlashBack button and BIOS FlashBack LED, while CrashFree BIOS 3 provides another ASUS firmware-related feature. The motherboard also includes ASUS EZ DIY functionality, a DIY Friendly Design and a CPU socket lever protector, bringing together several features intended to assist with system building and firmware management.
Protection and durability features include ASUS 5X Protection III, ESD Guards and overvoltage protection. ASUS Stainless Steel Back I/O and ASUS SafeSlot are also incorporated into the hardware design. Together with the motherboard's power, cooling and firmware features, these technologies form part of the PRIME B850M-K's focus on stable system operation and protection of critical hardware.
The motherboard additionally supports BMC remote management and is compatible with Windows 11. Included software comprises Armoury Crate, ASUS Fan Xpert 4, ASUS CPU-Z and ASUS Control Center Express. Adobe Creative Cloud is supplied as a free trial, Norton 360 Deluxe is included as a 60-day trial, and WinRAR is also provided.
Measuring 24.4 cm wide and 22.1 cm deep, the PRIME B850M-K uses the micro ATX form factor. The package contains the ASUS PRIME B850M-K motherboard itself, two Serial ATA cables, an I/O shield, an M.2 screw package and an M.2 backplate rubber package, providing the specified motherboard accessories and cabling in the box.
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The ASUS PRIME B850M-K, model 90MB1LV0-M0EAY0, is a micro ATX motherboard built around the AMD B850 chipset and Socket AM5 platform. It supports AMD Ryzen 7000, 8000 and 9000 Series processors, with provision for one CPU. Designed to provide a capable foundation for a modern AMD system, it combines DDR5 memory support, PCIe expansion, M.2 and SATA storage connectivity, integrated networking, eight-channel HD Audio and a broad selection of external and internal interfaces. Onboard display connectivity is also provided for use with a processor that supports graphics output.
Memory support is based on a dual-channel DDR5 architecture with two 288-pin DIMM slots and a maximum supported capacity of 256 GB. Supported memory clocks include 4000 MHz as well as 4100 MHz and 4200 MHz when overclocked. The board supports on-die ECC, non-ECC and ECC memory integrity options, together with AMD EXPO technology. ASUS Enhanced Memory Profile technology is included, with both AEMP and AEMP III among the motherboard's hardware features, while ASUS OptiMem II is incorporated as part of the memory implementation.
Storage options cover both M.2 and conventional SATA drives. Two M.2 sockets are provided, including one 2280 M.2 slot and one M.2 Key M socket supporting 2242, 2260 and 2280 form factors. The storage interfaces comprise one PCIe 5.0 M.2 connection and one PCIe 4.0 M.2 connection, alongside four SATA-600 connectors using 7-pin Serial ATA connections. AMD RAID Xpert2 Technology is supported for RAID functionality and storage management. An M.2 heatsink, M.2 Q-Latch, M.2 screw package and M.2 backplate rubber package are also part of the supplied feature and accessory set.
Expansion capabilities include a PCIe 5.0 x16 slot and a PCIe 4.0 x16 slot operating in x4 mode, allowing the motherboard to accommodate graphics and other compatible expansion hardware. ASUS SafeSlot and Q-Slot features are included, while Q-DIMM, Q-Connector, Q-Code and Q-LED form part of the wider ASUS Q-Design feature set intended to support system assembly, configuration and hardware management.
The PRIME B850M-K provides extensive USB connectivity through both its rear interfaces and internal headers. External connections include two USB 3.2 Gen 2 ports, two USB 3.2 Gen 1 ports and four USB 2.0 ports. Internally, the motherboard provides a USB-C 3.2 Gen 1 header, two USB 3.2 Gen 1 connections through headers and four USB 2.0 connections through headers. Additional internal connections include serial, SPDIF output, SPI and audio headers, giving the board a varied set of options for compatible chassis connections and system hardware.
Display connectivity consists of one HDMI interface and one DisplayPort, with graphics output requiring a suitable CPU with onboard graphics capability. A combined PS/2 keyboard and mouse connection is also available. For wired networking, the motherboard incorporates a 2.5 Gigabit Ethernet interface, while ASUS LANGuard is included among its hardware features. Preboot eXecution Environment, or PXE, support and wake on LAN functionality are also provided, along with wake on PME support.
Audio is handled by an eight-channel HD Audio implementation compliant with the High Definition Audio standard. Rear audio connectivity comprises dedicated mini-jack connections for line output, microphone input and line input. The audio feature set also includes jack detection, jack retasking and an anti-pop function, while an internal audio header and an SPDIF output header provide further connection options.
Power delivery uses a 24-pin main motherboard power connector together with an 8-pin ATX12V connection. The board incorporates an 8+2+1 phase power design and ASUS DIGI+ VRM technology, complemented by a VRM heatsink design. A dedicated Water Pump Header is also included for compatible cooling configurations.
Firmware management is based on an AMI UEFI BIOS and includes ASUS EZ Flash for BIOS updating. BIOS FlashBack functionality is supported through a dedicated BIOS FlashBack button and BIOS FlashBack LED, while CrashFree BIOS 3 provides another ASUS firmware-related feature. The motherboard also includes ASUS EZ DIY functionality, a DIY Friendly Design and a CPU socket lever protector, bringing together several features intended to assist with system building and firmware management.
Protection and durability features include ASUS 5X Protection III, ESD Guards and overvoltage protection. ASUS Stainless Steel Back I/O and ASUS SafeSlot are also incorporated into the hardware design. Together with the motherboard's power, cooling and firmware features, these technologies form part of the PRIME B850M-K's focus on stable system operation and protection of critical hardware.
The motherboard additionally supports BMC remote management and is compatible with Windows 11. Included software comprises Armoury Crate, ASUS Fan Xpert 4, ASUS CPU-Z and ASUS Control Center Express. Adobe Creative Cloud is supplied as a free trial, Norton 360 Deluxe is included as a 60-day trial, and WinRAR is also provided.
Measuring 24.4 cm wide and 22.1 cm deep, the PRIME B850M-K uses the micro ATX form factor. The package contains the ASUS PRIME B850M-K motherboard itself, two Serial ATA cables, an I/O shield, an M.2 screw package and an M.2 backplate rubber package, providing the specified motherboard accessories and cabling in the box.
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UK Delivery Information
We deliver throughout the UK using trusted national courier networks, with every order handled securely from dispatch to delivery.
UK Delivery Details
£6.99 — 1 to 3 working days
Fully tracked, fully insured, and signature required on delivery for added protection.
All parcels are sent using secure, monitored delivery services. Tracking details are provided so you can follow your order at every stage, and a signature is required at the delivery address to ensure your item is received safely by the correct person. Insurance cover is included from dispatch through to successful delivery, giving extra peace of mind when purchasing higher-value electronics.
Delivery days and exclusions
Delivery working days are Monday to Friday (excluding bank and public holidays).
Security and privacy:
We will never ask for personal information (such as passwords or payment details) in an email, phone call or message. We do not take payments over the phone. If you receive such a request, please do not respond to it. If you have any questions regarding a message or email you received, call our Support team, contact details below.
Call us by phone
UK: 01902 214077
+44 (0) 1902 214077
Support Hrs: 10am to 3pm, Monday-Friday. Excluding bank holidays and company holidays.
We are UK VAT registered. Orders are dispatched from our distribution centre in Lutterworth, UK. A tracking number is provided and a signature is required on delivery. We deliver throughout the UK. Tracked and Insured, signature required delivery.
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Manufacturer Warranty Information
All products sold on our website are brand new and supplied through authorised UK distributors. Each item is covered by the manufacturer’s warranty, with the length and terms set by the brand (for example Apple, ASUS, Dell, Lenovo and others). The specific warranty period is shown on the individual product page.
After delivery, customers should register their product on the manufacturer’s website to activate and manage their warranty. In the event of a fault, support, diagnosis and repair are handled directly by the manufacturer through their official service centres, as they are best placed to provide technical assistance, parts and replacements under their warranty terms.
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