ASUS PRIME B850M-K
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ASUS PRIME B850M-K
The ASUS PRIME B850M-K is a microATX motherboard designed for modern builds with AMD Ryzen™ 9000, 8000 and 7000 series processors in the AM5 socket. It combines the powerful AMD B850 chipset with support for fast DDR5 memory, a PCIe 5.0 interface and enhanced power delivery for stable operation even under prolonged load. With integrated ASUS technologies such as AI Cache Boost and AI Advisor, it optimises performance not only in everyday applications, but also in AI work scenarios and local LLM models. The board is built with an emphasis on user-friendliness, tuning options via UEFI BIOS and software, effective cooling and extensive connectivity for modern peripherals and high-speed storage.
AMD B850
Chipset
AMD AM5
Socket
mATX (Micro ATX)
Format
DDR5
Memory type
2×
Number of RAM slotsKey features of the ASUS PRIME B850M-K motherboard
- AI Cache Boost function enhances local LLM model performance
- 8+2+1 power stages with Digi+ VRM digital control
- DDR5 module optimisation via ASUS AEMP and AMD EXPO™ support
- One M.2 slot with PCIe 5.0 ×4 (128Gb/s)
- Cooling management via Fan Xpert 2+ and hybrid fan headers
- Realtek 2.5Gb Ethernet with low CPU load
- Three ARGB Gen2 headers and Aura Sync support
- Reinforced PCIe SafeSlot for graphics cards
Power, stability and tuning
The 8+2+1 power stage is complemented by a multi-layered PCB that effectively dissipates heat from the VRM area. The Digi+ VRM digital control provides precise voltage control and contributes to stable processor operation during boost modes. The UEFI BIOS offers both a simple control interface for everyday users and detailed tuning options for experienced builders.
Maximum DDR5 memory performance
The PRIME B850M-K motherboard offers comprehensive tools for optimising DDR5 modules. For standard memory, it uses ASUS Enhanced Memory Profile (AEMP) with automatic chip detection and optimised profiles. Advanced users will appreciate the support for AMD EXPO™ profiles and extensive UEFI settings for overclocking and maximum performance.
Cooling, software and expansion options
The cooling system includes multiple onboard passive heatsinks and hybrid fan connectors for both fans and water pumps. Fan Xpert 2+ provides automatic setup and a quiet mode for low-load situations. Software like Armoury Crate provides driver management, Aura Sync RGB effects settings and other system management. The reinforced SafeSlot provides stronger mechanical support for graphics cards using PCIe 5.0.
Port selection
Storage
- Number of SATA III: 4
- Number of M.2: 2
- M.2 Slot – 1× M.2 PCI-E NVMe Gen5
- M.2 Slot – 1× M.2 PCI-E NVMe Gen4
- Features: RAID 0, RAID 1, RAID 5, RAID 10
USB ports
- Internal USB 2.0: 4 (2 headers)
- Internal USB 3.2 Gen 1: 2 (1 header)
- Internal USB-C 3.2 Gen 1: 1 (1 connector)
- Rear USB 2.0: 4
- Rear USB 3.2 Gen 1: 2
- Rear USB 3.2 Gen 2: 2
Graphics
- HDMI 2.1: 1
- DisplayPort 1.4: 1
- Graphics outputs: DisplayPort 1.4, HDMI 2.1
Sound
- Number of channels: 7.1
- Rear connectors: 3× 3.5mm Jack
- Internal connectors: S/PDIF, Front Panel Audio
Other
- Rear: RJ-45 (LAN) 2.5Gbps, PS/2 combo port
- Power: 24-pin, 8-pin
- Cooling: number of PWM FAN (4-pin) - 4 (1× CPU Fan, 3× Chassis Fan)
- Internal: 3× Addressable RGB Gen 2 header, COM header, TPM header, Clear CMOS header
Choosing a motherboard
When choosing a motherboard (or mainboard), it is important to pay particular attention to the motherboard socket type, format, and chipset. These are the most important parameters and ensure the board is compatible with the processor, expansion cards, and other components. The specific socket determines your choice of processor, while the remaining connectors dictate which other components you'll need for your future computer.Specifications
Socket and chipset
Format & functions
Memory
Advanced parameters
Connectors
Compatibility
Colour
| Code: | ACb850p3 |
| Warranty: | 36 months |
| Links: | Producer's Website: |
| Manufacturer information |
ASUSTek COMPUTER INC. 1F.,No.15, Lide Rd., Beitou Dist., Taipei City 112 Tel: +886-2-2894-3447 Tel: +886-2-2890-7798 https://gr.asus.com/ProductSafety ASUS COMPUTER GmbH Harkortstrasse 21-23 40880 Ratingen Germany, Europe Email: [email protected] ASUS COMPUTER GmbH, Harkortstrasse 21-23, 40880 Ratingen, Germany, Europe, [email protected] ASUS is a symbol of the growth of Taiwan's economy. The firm's beginnings date back to April 2, 1989, when as a small manufacturer of motherboards began his work with a few employees. Today, Asus employs more than 12,500 employees worldwide. ASUS products can be found in almost every category of the information technology marketplace. ASUS is focused on desktops, laptops, phones, optical drives and components. In the manufacture of motherboards, the company is now the dominant player with a staggering 40% market share. 
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