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ASUS PRIME B850M-K mATX motherboard with Ryzen 9 9950X3D CPU installed

ASUS

ASUS PRIME B850M-K & Ryzen 9 9950X3D AMD motherboard combo

SKU CH-SY51-JZSYB

AM5 motherboard and 16-core Ryzen 9 9950X3D CPU with 128 MB L3 cache, DDR5 8400 MT/s support, PCIe 5.0 slot, three M.2 slots and 2.5 Gb Ethernet

  • CPU socketAM5
  • AM5 socket ready for Ryzen 9 9950X3D processor
  • 128 MB L3 cache boosts multi-threaded throughput
  • DDR5 8400 MT/s overclock headroom for faster memory
  • PCIe 5.0 slot and 2.5 Gb Ethernet for high-speed I/O
  • 8+2+1 power stages on 6-layer PCB deliver stable 170 W operation

ASUS PRIME B850M-K with Ryzen 9 9950X3D

This bundle pairs an AM5 micro-ATX motherboard with a 16-core desktop processor built on TSMC 4nm FinFET Granite Ridge architecture. It targets enthusiasts who want high core counts and large cache for gaming or content creation. The board supplies three M.2 slots and a PCIe 5.0 slot for modern storage and graphics cards. A Realtek 2.5 Gb wired NIC handles wired networking.

Sustained-load behaviour with 8+2+1 power modules

The 8+2+1 power modules and 6-layer PCB feed the 170W CPU through Digi+ VRM digital control with real-time voltage regulation. VRM heatsinks, thermal pads and an M.2 heatsink dissipate heat during long rendering or compile sessions. Four-pin PWM/DC fan headers with intelligent protection adjust airflow automatically. DDR5 memory can reach 8400 MT/s when overclocked for sustained bandwidth.

Straightforward installation

The UEFI BIOS presents clear menus for memory tuning and fan curves, reducing first-boot friction. Aura Sync and second-generation addressable ARGB pins let builders synchronise lighting without extra controllers. Rear USB includes a 10 Gbps Type-A port and a Type-C connector for fast peripherals. Ensure the chassis accommodates the board's micro-ATX layout and the CPU cooler clears the VRM heatsinks.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $871.99
Pricier than about 82% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME B850M-K+R9 9950 × 3D
Processor
CPU socketAM5

Questions about this item

How much heat does the Ryzen 9 9950X3D produce under sustained load?

The CPU has a 170W thermal design power, so the VRM heatsinks, thermal pads and dedicated M.2 heatsink on the PRIME B850M-K are sized to dissipate that output during all-day workloads.

Which memory kit must I already own to reach the advertised DDR5 8400 MT/s on this board?

You need a DDR5 kit rated for 8400 MT/s or higher; the motherboard tops out at that speed when overclocked, so slower modules will run at their own rated frequency instead.

Will my existing PCIe 4.0 graphics card work in the PCIe 5.0 slot without a bottleneck?

Yes, the board's PCIe 5.0 x16 slot is backward compatible, so a PCIe 4.0 GPU will operate at its full 4.0 bandwidth without any configuration changes.

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