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ASUS PRIME B650M-K-CSM micro ATX motherboard with AMD Ryzen 9 9950X CPU in AM5 socket

ASUS

ASUS PRIME B650M-K-CSM AMD motherboard & Ryzen 9 9950X CPU combo

SKU CH-N77X-BTB2P

A micro-ATX AM5 motherboard paired with a 16-core 32-thread Ryzen 9 9950X reaching 5.7 GHz, plus DDR5-5600 support, dual M.2 PCIe 5.0 slots, 2.5 Gb Ethernet and USB 3.2 Gen 2

  • CPU socketAM5

Model PRIME B650M-K-CSM

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CPU +Ryzen 9 9950X

  • 16 cores and 32 threads handle heavy workloads
  • 7 GHz max boost accelerates single-thread performance
  • PCIe 5.0 M.2 slot enables ultrafast storage
  • 5 Gb Ethernet plus USB 3.2 Gen 2 deliver fast connectivity
  • VRM, M.2 and PCH heatsinks with Fan Xpert 2+ keep temperatures low

Combo for AI workloads

This bundle pairs an ASUS PRIME B650M-K-CSM micro ATX motherboard with an AMD Ryzen 9 9950X processor. The CPU delivers 16 cores and 32 threads based on the Zen 5 architecture, reaching a 5.7 GHz maximum boost frequency. It targets builders who need high multi-threaded performance for advanced AI computing tasks. The platform uses the AM5 socket and supports DDR5-5600 memory.

Connectivity limits

The board provides two M.2 slots, with one capable of PCIe 5.0 speeds for fast storage. Rear I/O includes USB 3.2 Gen 2 ports and a front-panel USB 3.2 Gen 1 Type-C header. Networking relies on a Realtek 2.5 Gb Ethernet controller. These interfaces set the practical bandwidth ceiling for peripherals and drives attached to this platform.

Installation notes

The processor ships without a cooler, so a compatible AM5 solution must be sourced separately. Mount the CPU carefully into the socket, apply thermal paste, and secure the cooler before populating the four DDR5 slots. The M.2 heatsink requires a small screw that is easy to drop; magnetic tips help. Fan Xpert 2+ and hybrid headers simplify fan configuration once the system posts.

How it compares

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

Price $737.99
Pricier than about 76% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME B650M-K-CSM+R9 9950X
Processor
CPU socketAM5

Other versions of this model

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Questions about this item

Should I pick the 16-core Ryzen 9 9950X or a lower-tier CPU for this B650 board?

The combo ships with the 16-core 9950X already paired to the PRIME B650M-K-CSM; no alternative CPU is offered in this bundle.

What does the 5.7 GHz max boost mean once the chip is installed?

The 9950X can reach 5.7 GHz on up to two cores when thermals and power headroom allow; all-core speeds will sit lower under sustained loads.

What does the M.2 PCIe 5.0 label cap in practice?

The slot is wired for PCIe 5.0 x4, so a compatible drive can hit its rated sequential throughput; actual speed depends on the drive and system cooling.

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