ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors.

The PRIME B850M-K motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It’s designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.
 

• AMD B850 mATX motherboard
• DDR5
• PCIe 5.0 Ready
• Two M.2 slots
• Realtek 2.5Gb Ethernet
• DisplayPort
• HDMI
• Rear USB 10Gbps Type-A
• Front USB 5Gbps Type-C
• BIOS FlashBack
• Aura Sync

• AI Advisor - ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.
• Digital Power Design - PRIME B850M-K features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors plus steady performance for day-to-day use.
• Six-layer PCB design - The multi-layered printed circuit board design quickly dissipates heat around the voltage regulators to improve overall system stability and provide the CPU with more overclocking headroom.
• Digi+ VRM control - The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings.
   

Description

Specification

• Motherboard Type: Desktop
• Form Factor: Micro ATX
• Socket: AMD AM5
• Chipset: AMD B850
• #Hide#DDR Type: DDR5
• CPU Support: Click here for CPU support
• RAM Technology: "DDR5 (Dual Channel)
  ECC and Non-ECC Un-buffered DIMM*
  Supports AMD EXPO
  ASUS AEMP
  
  *Non-ECC, un-buffered DDR5 memory supports On-Die ECC function"
• RAM Slots: 2 x DIMM
• RAM Speeds: 8200+MT/s(OC) with Ryzen 9000 CPUs
  8400+MT/s(OC) with Ryzen 8000 CPUs
  8000+MT/s(OC) with Ryzen 7000 CPUs
• Maximum Memory: 128GB
• Graphics: Integrated Graphics
  Graphics specifications may vary between CPU types
• Graphics Ports: 1 x HDMI
  1 x DisplayPort
• PCI/PCI Express: Ryzen 9000 & 7000 Series CPUs:
  1 x PCIe 5.0 x16 (supports x16 mode)
  
  Ryzen 8000 Series CPUs:
  1 x PCIe 4.0 x16 (supports x8/x4 mode)
  
  AMD B850 Chipset:
  1 x PCIe 4.0 x16 (support x4 mode)
• Storage: 4 x SATA III
  2 x M.2
  
  Ryzen 9000 & 7000 Series CPUs:
  M.2_1 (2280) - PCIe 5.0 x4
  M.2_2 (2242/2260/2280) - PCIe 4.0 x4
  
  Ryzen 8000 Series CPUs:
  M.2_1 (2280) - PCIe 4.0 x4
  M.2_2 (2242/2260/2280) - PCIe 4.0 x4/x2
• RAID: Ryzen 9000 Series CPUs: RAID 0/1/5/10
  Ryzen 8000 Series CPUs: RAID 0/1
  Ryzen 7000 Series CPUs: RAID 0/1/10
• Wireless: -
• LAN: 2.5GB LAN
• Audio: Realtek 7.1 Surround Sound High Definition Audio CODEC
• USB Ports Supported: Rear:
  2 x USB 10Gbps Type-A
  2 x USB 5Gbps Type-A
  4 x USB 2.0
  
  Front:
  1 x USB 5Gbps Type-C
  2 x USB 5Gbps
  4 x USB 2.0
• Back Panel I/O Ports: 2 x USB 10Gbps Type-A
  2 x USB 5Gbps Type-A
  4 x USB 2.0
  1 x DisplayPort
  1 x HDMI
  1 x Realtek 2.5Gb Ethernet
  3 x Audio jacks
  1 x BIOS FlashBack button
  1 x PS/2 Keyboard/Mouse combo
• Internal I/O Connectors: 1 x 4-pin CPU Fan
  3 x 4-pin Chassis Fan
  1 x 24-pin Main
  1 x 8-pin +12V CPU
  2 x M.2 (Key M)
  4 x SATA 6Gb/s
  1 x USB 5Gbps Type-C
  1 x USB 5Gbps
  2 x USB 2.0
  3 x Addressable RGB Gen2
  1 x Clear CMOS
  1 x COM Port
• .: 1 x Front Panel Audio
  1 x S/PDIF Out
  1 x SPI TPM (14-1 pin)
  1 x 10-1 pin System Panel
• Accessories: 2 x SATA 6Gb/s cables
  1 x I/O Shield
  1 x M.2 rubber package
  1 x Screw package for M.2 SSD
  1 x Quick start guide
• Additional Features: See Overview
• Package Type: Retail
• Package Weight: 1.0690 kg
• Warranty: 3 Years
• #Hide#M.2 Slot(s): Yes (M.2)
• #Hide#No. LAN Ports: 1 x LAN
• #Hide#Max LAN Speed: 2.5GB LAN