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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.
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.
The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings.
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.
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.
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+ 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.
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 reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.
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.
ASUS Prime B850M-K mATX Socket AM5 Motherboard
CPU
| CPU Socket | Socket AM5 |
| CPU Brand | AMD |
| 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 |
| 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
| 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) |
| 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 |
Memory
| Memory Bus Speed | Up to 8200 MT/s |
| Memory Type | DDR5 |
| Maximum RAM | 128 GB |
| Memory Slot | 2 x DIMM |
Motherboard
| Northbridge | AMD B850 |
| RAID Supported | Yes |
| RAID Format | RAID 0, 1, 10 |
| SATA Supported | Yes |
Expansion
| Number of PCI Express Slots | 1 x PCI Express 5.0 x16 slot 1 x PCI Express 4.0 x16 slot (@ x4) |
Graphics Device
| Integrated Graphics Supported | Yes |
Warranty
| Warranty | 3 Years |
Sound
| Integrated Sound | Realtek |
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 (may be trial or restricted) | 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 |
Key Features
| RDIMM Memory Supported | No |
| RDIMM Memory Required | No |
| Wireless Network | No |
| Motherboard Width | 244 mm |
| Motherboard Height | 244 mm |
| Main Colour | Black |
| Memory Channel | Dual |
| On-board Audio Type | 7.1 |
| Number of SATA Ports | 4 port(s) |
| Number of USB Ports | 8 port(s) |
| USB 3.0 Support | Yes |
| Multi GPU Support | No |
| VGA Connection | No |
| DVI Connection | No |
| HDMI Connection | Yes |
| DisplayPort Connection | Yes |
| Motherboard Form Factor | mATX |
| Motherboard (EPS) Power Connectors | 4+4-Pin |
| Motherboard Chipset | AMD B850 |
| Thunderbolt | No |
| Motherboard Model | ASUS Prime B850M-K |
| USB 3.1 Support | Yes |
| Internal USB3.0 Header | Yes |
| M.2 Support | Yes |
| On-board RGB Control | ASUS Aura Sync |
| RGB Header Type | 3-Pin ARGB |
| Addressable RGB | Yes |
| Internal USB Type-C Header | Yes |
| Power Requirement (auto) | 60 W |
| Max Memory Speed Supported (overclocked) | 8200 MT/s |
| CPU Power Pins (female) | 8 |
| Total M.2 Slots | 2 |
| Maximum NVMe M.2 ports | 2 |
| SATA ports | 4 |
| No. of front USB2.0 ports supported | 4 |
| No. of front USB3.0 ports supported | 2 |
| No. of front USB-C ports supported | 1 |
| Back Connect Support | No |
Item Details
| Manufacturer | ASUS |
| Manufacturer Code | 90MB1LV0-M0EAY0 |
| EAN | 4711636005524 |
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