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ASUS Prime B850M-K mATX Motherboard for AMD AM5 CPUs
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.
Enhanced DDR5 performance
Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B850M-K maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.
For entry-level modules without EXPO™ support, ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimized profiles for enhanced performance.
For those looking to surpass stock DDR5 speeds, the PRIME B850M-K offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.
Two M.2 slots (up to 128 Gbps)
PRIME B850M-K offers a total of two M.2 slots, including one that supports data-transfer speeds of up to 128 Gbps via PCIe 5.0, and one that support PCIe 4.0. This enables quicker boot-up and app load times with OS or application drives.
Cooler by design
The PRIME B850M-K motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool and stable under intense workloads.
ASUS Fan Xpert 2+
ASUS Fan Xpert 2+ software provides comprehensive control over fans. An Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.
Empowering connections
This motherboard offers a versatile range of connectivity, including support for PCIe 5.0 slot and an arsenal of USB ports which includes Type-C® connection.
Realtek 2.5 Gb Ethernet
Realtek 2.5 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.
High Speed Transferring
Numerous USB ports support high-end rigs loaded with peripherals, including two rear USB Type-A ports with transmission speeds of up to 10Gbps and a front USB Type-C® connector with ultrafast USB 5Gbps for transmission speeds of up to 5Gbps.
CPU
- Installed Processors (Max): 0 (1)
- Supported Processor Manufacturer: AMD
- Supported Processors: AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors
- 64-bit Support: Yes
- Socket: AM5
Rear Panel I/O Ports
- USB Ports: 2 x USB 3.1
- 2 x USB 3.0
- 2 x USB 2.0
- DisplayPorts: 1 x DisplayPort 1.4
- HDMI Port: 1 x HDMI 2.1
Internal I/O Connectors
- SATA Connectors: 4 x SATA
- USB Connectors: 1 x USB-C 3.0 header (supports 1 port)
- 1 x USB 3.0 header (supports 2 ports)
2 x USB 2.0 header (supports 4 ports)
Memory
- Memory Bus Speed: Up to 8200 MT/s
- Memory Type: DDR5
Motherboard
- Northbridge: AMD B850
- RAID Supported: Yes
- RAID Format: RAID 0, 1, 10
- SATA Supported: Yes
Rear Panel I/O Ports
- Keyboard/Mouse Combo Port: 1 x PS/2
- RJ-45 Ports: 1 x RJ-45
- Audio Line In Ports: 1 x 3.5mm Jack
- Audio Line Out Ports: 1 x 3.5mm Jack
- Microphone In Port: 1 x 3.5mm Jack
Internal I/O Connectors
- Front Panel Connectors: 1 x Front Panel
- 1 x Front Audio
- Cooling Fan Support: 1 x CPU fan header
- 3 x Chassis fan headers
- S/PDIF Connectors: 1 x S/PDIF Out header
- Serial Connectors: 1 x COM header
- TPM Header: 1 x SPI TPM header
- Power Connector Port: 1 x 24-pin ATX
- 1 x 8-pin EPS
- Other Connectors: 1 x M.2 slot, Key M, Type 2280 (PCIe Gen5)
- 1 x M.2 slot, Key M, Type 2242/2260/2280 (PCIe Gen4)
- 3 x 3-pin ARGB headers
Expansion
- Number of PCI Express Slots: 1 x PCI Express 5.0 x16 slot
- 1 x PCI Express 4.0 x16 slot (@ x4)
Memory
- Maximum RAM: 128 GB
- Memory Slot: 2 x DIMM
Graphics Device
- Integrated Graphics Supported: Yes
Sound
- Integrated Sound: Realtek
Warranty
- Warranty: 3 Years
Network
- Integrated Network: Realtek
- Network Speeds Supported: Up to 2.5 Gbps
- Wireless LAN: No
- Bluetooth: No
System Requirements
- Operating Systems Supported: Microsoft Windows 11
System
- Software Included: Yes
- Drivers: Yes
Physical
- Form Factor: mATX Motherboard
- In The Box: Motherboard
- 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
- Width: 244 mm
- Length: 244 mm
- Weight: 0.69 kg
Identifiers
- Stock Code: MBD3898
- Mfg Code: 90MB1LV0-M0EAY0
Warranty
- Warranty: 3 Years
