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Product Overview

The Asus PRIME B850M-K is a micro-ATX motherboard for Socket AM5 built on the AMD B850 chipset. It supports Ryzen 7000, 8000 and 9000 series processors, including X3D models, and offers two DDR5 DIMM slots for up to 128 GB of memory. What sets it apart in a compact board is a PCIe 5.0 x16 slot, a PCIe 5.0 M.2 slot, and Realtek 2.5 Gb Ethernet.

This board suits a compact AM5 gaming or general-purpose PC where you want current-generation storage and graphics connectivity without paying for extras you do not need. Storage is covered by two M.2 slots (one PCIe 5.0, one PCIe 4.0) and four SATA III ports, with RAID 0, 1, 5 and 10 support. It has three addressable RGB headers with AURA Sync, an HDMI and DisplayPort output for CPUs with integrated graphics, and no onboard Wi-Fi. A BIOS update may be needed for the newest processors.

Specification

• Manufacturer: Asus
• Model: PRIME B850M-K
• MPN: 90MB1LV0-M0EAY0
• EAN: 4711636005517
• CPU socket: AMD Socket AM5
• Chipset: AMD B850
• Form factor: micro-ATX
• Supported processors: AMD Ryzen 7000, 8000 and 9000 series
• Memory: 2x DDR5 DIMM, dual-channel, up to 128 GB
• Memory speed: DDR5-5600 / 5200 / 4800 / 4400 MT/s
• Expansion slots: 1x PCIe 5.0 x16, 1x PCIe 4.0 x16 (x4 lanes), 1x PCIe x1
• M.2 slots: 2x M.2 (M key): slot 1 PCIe 5.0, slot 2 PCIe 4.0, up to 2280
• SATA: 4x SATA III, RAID 0/1/5/10
• Rear USB: 2x USB-A 3.2 Gen 2 (10 Gbit/s), 2x USB-A 3.2 Gen 1 (5 Gbit/s), 4x USB 2.0
• Video outputs: 1x HDMI, 1x DisplayPort (CPUs with integrated graphics only)
• Networking: Realtek 2.5 Gb Ethernet, no Wi-Fi
• Audio: Realtek 7.1 surround codec
• RGB: 3x addressable RGB headers, AURA Sync
• Dimensions (W x D): 244 x 221 mm

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