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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.

CPU

AMD Socket AM5

  • Supports AMD Ryzen 7000 / 8000 / 9000 Series Desktop Processors
ChipsetAMD B850
Memory

2 x DIMM slots, max. 128GB, DDR5 Supports up to

  • 8200+MT/s(OC) with Ryzen 9000 Series Processors,
  • 8400+MT/s(OC) with Ryzen 8000 Series Processors,
  • 8000+MT/s(OC) with Ryzen 7000 Series Processors
  • ECC and Non-ECC Un-buffered DIMM
  • Dual Channel Memory Architecture 
  • Supports AMD EXTended Profiles for Overclocking (EXPO)
  • ASUS Enhanced Memory Profile (AEMP)
Onboard Graphics

Integrated Graphics Processor:

  • 1 x DisplayPort
    • Supports max. 8K@30Hz as specified in DisplayPort 1.4.
  • 1 x HDMI port 
    • Supports 4K@60Hz as specified in HDMI 2.1.
Audio

Realtek 7.1 Surround Sound High Definition Audio CODEC

  • Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
  • Supports up to 24-Bit/192 kHz playback
    • A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
  • Audio Features:
    • Audio Shielding
    • Premium audio capacitors
    • Dedicated audio PCB layers
LAN

1 x Realtek 2.5Gb Ethernet

  • ASUS LANGuard
Wireless Communication Module

None

Expansion Slots

AMD Ryzen 9000 & 7000 Series Desktop Processors

  • 1 x PCIe 5.0 x16 slot (supports x16 mode)

AMD Ryzen 8000 Series Desktop Processors

  • 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)

AMD B850 Chipset

  • 1 x PCIe 4.0 x16 slot (support x4 mode)
Storage Interface

Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports

AMD Ryzen 9000 & 7000 Series Desktop Processors

  • M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode)
  • M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)

AMD Ryzen 8000 Series Desktop Processors

  • M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
  • M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)

AMD B850 Chipset

  • 4 x SATA 6Gb/s ports

AMD RAIDXpert2 Technology

  • Ryzen 9000 Series Processors: RAID 0/1/5/10
  • Ryzen 8000 Series Processors: RAID 0/1
  • Ryzen 7000 Series Processors: RAID 0/1/10
USB

Rear USB (Total 8 ports)

  • 2 x USB 10Gbps ports (2 x Type-A)
  • 2 x USB 5Gbps ports (2 x Type-A)
  • 4 x USB 2.0 ports (4 x Type-A)

Front USB (Total 7 ports)

  • 1 x USB 5Gbps connector (supports USB Type-C)
    • USB Type-C power delivery output: max. 5V/3A
  • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
  • 2 x USB 2.0 headers support 4 additional USB 2.0 ports
Internal I/O Connectors

Fan and Cooling Related

  • 1 x 4-pin CPU Fan header
  • 3 x 4-pin Chassis Fan headers

Power Related

  • 1 x 24-pin Main Power connector
  • 1 x 8-pin +12V CPU Power connector

Storage Related

  • 2 x M.2 slots (Key M)
  • 4 x SATA 6Gb/s ports

USB

  • 1 x USB 5Gbps connector (supports USB Type-C)
  • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
  • 2 x USB 2.0 headers support 4 additional USB 2.0 ports

Miscellaneous

  • 3 x Addressable RGB Gen 2 headers
  • 1 x Clear CMOS header
  • 1 x COM Port header
  • 1 x Front Panel Audio header (F_AUDIO)
  • 1 x S/PDIF Out header
  • 1 x SPI TPM header (14-1 pin)
  • 1 x 10-1 pin System Panel header
Back Panel Connectors
  • 2 x USB 10Gbps ports (2 x Type-A)
  • 2 x USB 5Gbps ports (2 x Type-A)
  • 4 x USB 2.0 ports (4 x Type-A)
  • 1 x DisplayPort
  • 1 x HDMI port
  • 1 x Realtek 2.5Gb Ethernet port
  • 3 x Audio jacks
  • 1 x BIOS FlashBack button
  • 1 x PS/2 Keyboard/Mouse combo port
I/O Controller
  • Not Specified
H/W Monitoring
  • Voltage detection
  • Temperature detection
  • Fan speed detection
  • Fan fail warning
  • Fan speed control
BIOS

256 Mb Flash ROM

  • UEFI AMI BIOS
Unique Features

ASUS 5X PROTECTION III

  • DIGI+ VRM
  • LANGuard
  • Overvoltage protection
  • SafeSlot
  • Stainless-steel back I/O

ASUS Q-Design

  • Q-Dashboard
  • Q-DIMM
  • Q-LED Core
  • Q-Slot

ASUS Thermal Solution

  • M.2 heatsink
  • VRM heatsink design

ASUS EZ DIY

  • BIOS FlashBack button
  • BIOS FlashBack LED
  • SafeSlot

Aura Sync

  • Addressable RGB Gen 2 headers
Bundled Software

Armoury Crate

  • Aura Creator
  • Aura Sync
  • Fan Xpert 2+

ASUS AI Advisor

ASUS DriverHub

TurboV Core

ASUS CPU-Z

Adobe Creative Cloud (Free Trial)

Norton 360 Deluxe (60 Days Free Trial)

WinRAR (40 Days Free Trial)

UEFI BIOS

ASUS EZ DIY

  • ASUS CrashFree BIOS 3
  • ASUS EZ Flash 3
  • ASUS UEFI BIOS EZ Mode
  • ASUS MyHotkey
Operating System
  • Support for Windows 11 64-bit
Form Factor

Micro ATX Form Factor

  • 24.4cm x 22.1cm

Manufacturer
Manufacturer's WebsiteLink *
Product WebsiteLink *
Warranty Information
Warranty Duration3 Years
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ASUS PRIME B850M-K, AMD B850 Chipset, Socket AM5, Micro ATX Desktop Motherboard

- Socket Socket AM5, AMD B840 Chipset
- Supports Ryzen 7000 / 8000 / 9000 Series Processors
- 2 x DDR5 DIMM Slots, up to 128GB, DDR5-8400+
- 1 x PCIe 5.0 x16 Slot
- 1 x PCIe 4.0 x16 (x4 Electrical) Slot
- 1 x M.2 PCIe 5.0 NVMe Slot
- 1 x M.2 PCIe 4.0 NVMe Slot

- 4 x SATA 3.0 Ports, Supports RAID 0 / 1 / 5 / 10
- 2.5Gbps LAN
- 1 x HDMI 2.1, 1 x DisplayPort 1.4

- 2 x Rear USB Type-A 10Gb/s, 2 x USB Type-A 5Gb/s
- 4 x USB 2.0/1.1 Ports
- 1 x PS/2 Keyboard/Mouse Port
- 3 x Rear Audio Jacks
- BIOS Flashback: Update BIOS without CPU / RAM / GPU
- ASUS Q-LED Core for Boot Diagnostics
- 3 x ARGB Gen2 Headers
- Form Factor: Micro ATX
- 3 Year Warranty

  • Product Code: 90MB1LV0-M0EAY0
  • Availability: In Stock with Supplier leadtimeTooltip Lead Times:
    • In Stock with Progenix: Ready for collection/dispatch once payment clears. The cut-off for same-day dispatch is 12:00pm on business days.
    • In Stock with Supplier: 1-3 business days until dispatched or ready for collection
    • Out Of Stock: Contact us to see if this item will be restocked.
  • R3,470



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