ASUS PRIME B840M-K AM5 DDR5 PCIe 4.0 Micro-ATX Motherboard
ASUS PRIME B840M-K, AMD B840, AM5, DDR5, PCIe 4.0, 2x M.2, 2.5 GbE, USB 3.2 Gen1, AMD EXPO, mATX
Email me when the availability or price changes
Finance this product
- From £10.42 / month (APR 16.9%) for 12 months or 0% for 4 months
- Spend over £390.00 and Buy Now, Pay Later or spread the cost of your finance over 24-48 months with a 10% deposit.
- SCANPROTECT Protect against installation damage for 28 days.
- 48HR REPLACEMENT If you need to return this item, your replacement will be dispatched within 2 working days of your product arriving back at Scan.
PRIME B840M-K Ryzen™ AM5 Micro-ATX Motherboard from ASUS
Engineered for Next-Gen Performance ASUS PRIME B840M-K is a microATX motherboard built to unlock AMD Ryzen 9000 series performance with DDR5, PCIe 4.0, and AI-ready features. It combines an 8+2+1 power design, AEMP memory tuning, 2.5Gb Ethernet, and ASUS cooling controls to deliver a practical, builder-friendly platform for fast, stable, modern PC builds.
B840Chipset
AM5Socket
AMD Ryzen™ 9000/8000/7000 SeriesCPU Support
mATXForm Factor
AI Solutions
ASUS AI Solutions feature AI Cache Boost for accelerated LLM processing, and ASUS AI Advisor — your intelligent guide to peak PC performance.
AI Cache Boost Accelerate your LLM workflows with AI Cache Boost, exclusive to ASUS AMD 800 and 600 series motherboards paired with Ryzen™ 9000 Series CPUs. This advanced BIOS feature fine-tunes CPU cache and memory routing to unlock up to 29% faster local LLM performance through precision memory optimisation.
AI Advisor ASUS AI Advisor makes it easy to discover and understand the innovative features and capabilities built into ASUS motherboards.
Digital Power Design
Steady & Reliable Performance PRIME B840M-K employs an 8+2+1 power stage design with discrete MOSFETs, delivering efficient, stable power to AMD processors and reliable performance for everyday computing.
8 Vcore Power
2 SOC Power
1 Misc Power
Six-Layer PCB Design Enhanced stability and overclocking.
Digi+ VRM Control Real-time voltage control.
Enhanced Memory & Storage Performance
Enhanced DDR5 Performance
Extensive memory tuning sits at the heart of PRIME motherboards. The PRIME B840M-K unlocks the full potential of DDR5, from basic modules to high-speed performance kits.
For entry-level DDR5 without EXPO™ support, ASUS Enhanced Memory Profile (AEMP) intelligently identifies memory chips and applies optimised profiles to boost performance.
For users aiming beyond standard DDR5 speeds, the PRIME B840M-K delivers full AMD EXPO™ support and a broad range of UEFI options for in-depth performance tuning.
Dual M.2 slots (up to 64Gbps) The PRIME B840M-K features dual M.2 slots supporting up to 64 Gbps data transfer via PCIe 4.0, delivering faster boot times and rapid application loading for OS and software drives.
Cooler by Design
The PRIME B840M-K is built with multiple onboard heatsinks and versatile hybrid fan headers, keeping your system cool and stable under heavy workloads.
VRM Heatsink and Thermal Pad A large VRM heatsink paired with a high-quality thermal pad enhances heat dissipation from the MOSFETs and chokes, improving overall cooling efficiency.
4-Pin PWM/DC fan Every onboard fan header automatically detects and supports both PWM and DC fans.
Multiple Temperature Sources
Aside from the CPU fan header, each fan connector can monitor and respond to up to three user-defined thermal sensors for workload-based cooling, with full control available through Fan Xpert 2+ or the UEFI interface.
Fan Xpert 2+ lets you link the temperature data from supported ASUS graphics cards, enabling optimised cooling for both GPU and CPU heavy workloads.
Passive Chipset Heatsink An aluminium passive chipset heatsink delivers reliable cooling and consistent performance, offering greater durability and longevity than fan-based designs that can accumulate dust and debris.
Smart Protection A built-in integrated circuit safeguards every fan header against overheating and overcurrent for enhanced reliability.
Smart Cooling Precision
Empowering Connections
This motherboard delivers a versatile range of connectivity options, featuring PCIe 4.0 support, 2.5 Gb Ethernet, and a suite of USB ports, including convenient Type-C® connectors.
Realtek® 2.5Gb Ethernet Realtek® 2.5 Gb Ethernet minimises CPU overhead and delivers outstanding TCP and UDP throughput for faster, smoother data performance.
High Speed Transferring Multiple USB ports accommodate peripheral-heavy setups, featuring four rear USB 5 Gbps Type-A ports and a front USB 5 Gbps Type-C® connector for data speeds up to 5 Gbps.
PayPal Credit
| Monthly Payment: | £10.42 |
| Instalment Rate: | 16.9% p.a. (fixed) |
| Cost of purchase: | £114.95 |
| Total inc. interest: | £124.98 |
| Example | |
| Minimum Spend: | £99 |
| Instalment Rate: | N/A |
| Cost of purchase: | £99 |
| Total inc. interest: | £99 |
Representative Example:
Purchase Rate: 23.9% p.a. (variable)
Representative: 23.9% APR (variable)
Assumed Credit Limit: £1,200
Subject to status. Terms and Conditions apply.