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ASUS PRIME B650M-K-CSM micro ATX motherboard with Ryzen 9 9900X3D CPU installed

ASUS

ASUS PRIME B650M-K-CSM AMD Motherboard & Ryzen 9 9900X3D CPU Combo

SKU CH-03RR-50AC7

A micro-ATX AM5 motherboard paired with a 12-core Ryzen 9 9900X3D CPU featuring 128 MB L3 cache, PCIe 5.0 M.2, 2.5 Gb Ethernet and USB 3.2 Gen 2 ports

  • CPU socketAM5

Model PRIME B650M-K-CSM

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CPU +Ryzen 9 9900X3D

  • Ready for demanding AI workloads with AM5 platform power
  • 12-core Ryzen 9 9900X3D delivers 128MB L3 cache for gaming speed
  • M.2 PCIe 5.0 slot enables ultrafast storage throughput
  • Realtek 2.5Gb Ethernet plus USB 3.2 Gen 2 for quick network and peripheral links
  • 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 9900X3D processor. The board uses the AM5 socket and B650 chipset to support current Ryzen desktop CPUs. It targets builders who need a compact platform ready for advanced AI computing tasks. Connectivity includes 2.5 Gb Ethernet and USB 3.2 Gen 2 ports.

Sustained load behaviour

The Ryzen 9 9900X3D operates at a 120W TDP with 12 cores and 128MB L3 cache plus 12MB L2 cache. The motherboard provides a VRM heatsink, M.2 heatsink and PCH heatsink alongside hybrid fan headers managed by Fan Xpert 2+. This cooling arrangement helps maintain performance during extended AI or compute sessions.

Install experience

The micro ATX form factor fits a wide range of cases, while the front USB 3.2 Gen 1 Type-C header simplifies front-panel wiring. ASUS OptiMem II trace routing assists memory stability when pushing higher speeds. ASUS Control Center Express adds remote management tools for IT administrators. Aura Sync headers allow RGB lighting integration with compatible strips.

How it compares

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

Price $895.99
Pricier than about 83% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME B650M-K-CSM+R9 9900 × 3D
Processor
CPU socketAM5

Other versions of this model

5 more in the same range

Questions about this item

Does the motherboard fit in a standard micro ATX case?

Yes, the PRIME B650M-K-CSM uses the micro ATX form factor, so it fits any case that accepts micro ATX or larger boards.

Will the included Ryzen 9 9900X3D run without a separate graphics card?

The processor includes AMD Radeon graphics, so a display can be driven directly from the motherboard video outputs.

What cooling is required for the 120W processor?

A CPU cooler rated for at least 120W TDP is needed; the board provides a VRM heatsink, M.2 heatsink, PCH heatsink and hybrid fan headers controlled by Fan Xpert 2+.

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