Motherboard ASUS PRIME B850M-K AMD B850 Socket AM5 micro ATX

The ASUS PRIME B850M-K is a micro ATX motherboard with an AMD B850 chipset and Socket AM5, designed to support AMD Ryzen 7000, 8000 and 9000 series processors. It accepts DDR5 memory across two DIMM slots for up to 128 GB, and provides multiple storage options including M.2 and SATA III with RAID 0/1/5/10 support. The board includes a 2.5 Gigabit Ethernet interface and is built to deliver stable connectivity and performance for general PC builds and AI-capable systems.

Advantages

The PRIME B850M-K offers AM5 compatibility for the latest Ryzen CPUs, DDR5 memory support for higher bandwidth, and flexible storage options with M.2 and SATA III plus RAID functionality. Its micro ATX form factor balances compact system design and expandability, while the integrated 2.5 Gb Ethernet provides improved network throughput compared with standard Gigabit ports. Firmware and software utilities supply performance tuning and system management features.

Suitable for

• Home and office desktops
• Compact gaming or multimedia PCs
• DIY PC builds requiring AM5 and DDR5 support
• Workloads that benefit from faster networking (2.5 GbE)
• Systems that need M.2/NVMe and SATA storage with RAID

Key specifications

• Form factor: Micro ATX
• Chipset: AMD B850
• Processor socket: Socket AM5 (supports AMD Ryzen 7000/8000/9000 series)
• Memory: 2 × DDR5 DIMM slots, up to 128 GB
• Storage interfaces: M.2 and SATA III, RAID 0/1/5/10 supported
• Network: 2.5 Gigabit Ethernet
• Manufacturer part number (MPN): 90MB1LV0-M0EAY0
• EAN: 4711636005517

How to use

Install the PRIME B850M-K into a compatible micro ATX case, fit an AM5-compatible AMD Ryzen processor and apply the appropriate CPU cooler. Populate DDR5 modules into the two DIMM slots according to the motherboard manual, attach M.2 or SATA drives as needed, and connect power and front-panel headers from the case. Configure storage RAID, memory XMP/DOCP settings and network options in the UEFI BIOS or included software after the first boot.

Recommendations

For stable operation, use a compatible power supply and a CPU cooler rated for your chosen Ryzen processor. Install DDR5 modules matched in capacity and speed for best memory performance, and keep BIOS firmware updated to ensure compatibility with newer Ryzen 8000/9000 series CPUs.