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ASUS PRIME B850M-K mATX motherboard with AMD Ryzen 9 9900X CPU in AM5 socket

ASUS

ASUS PRIME B850M-K AMD motherboard & Ryzen 9 9900X CPU combo

SKU CH-028G-121ME

Pairs a B850 micro-ATX board with a 12-core 24-thread Ryzen 9 9900X CPU reaching 5.6 GHz boost, plus DDR5 8400 MT/s support, PCIe 5.0, three M.2 slots and 2.5 Gb Ethernet

  • CPU Socket TypeAM5

Motherboard PRIME B850M-K

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CPU + Ryzen 9 9900X

  • 12-core Ryzen 9 9900X CPU delivers 5.6 GHz max boost for heavy workloads
  • DDR5 memory scales to 8400 MT/s overclocked for high bandwidth
  • Three M.2 slots provide up to 128 Gbps total storage throughput
  • Realtek 2.5 Gb Ethernet plus rear USB 10 Gbps Type-A for fast wired connectivity
  • 8+2+1 power modules on a 6-layer PCB with Digi+ VRM ensure stable power delivery

Combo motherboard and CPU

This bundle pairs an ASUS PRIME B850M-K motherboard with a Ryzen 9 9900X processor. The board uses the AM5 socket and a 6-layer PCB with 8+2+1 power modules. The CPU delivers 12 cores and 24 threads based on Zen 5 architecture with a 5.6 GHz max boost clock.

Suits high-performance builds

Builders who want a ready-matched platform for demanding workloads benefit from the combined DDR5 8400 MT/s overclocking headroom and PCIe 5.0 slot support. Users needing integrated Wi-Fi or a bundled cooler should consider other options as neither is included here.

DDR5 8400 MT/s overclocking ceiling

The motherboard supports memory speeds up to DDR5 8400 MT/s when overclocked, while the processor officially supports DDR5 5600. This gap determines whether your memory kit can run at its rated XMP or EXPO profile without manual tuning.

Helstu kostir

  • 12-core Ryzen 9 9900X CPU delivers 5.6 GHz max boost for heavy workloads
  • DDR5 memory scales to 8400 MT/s overclocked for high bandwidth
  • Three M.2 slots provide up to 128 Gbps total storage throughput
  • Realtek 2.5 Gb Ethernet plus rear USB 10 Gbps Type-A for fast wired connectivity
  • 8+2+1 power modules on a 6-layer PCB with Digi+ VRM ensure stable power delivery

Tæknilýsing

BrandASUS
ModelPRIME B850M-K+R9 9900X
CPU Socket TypeAM5

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Does the box include a CPU cooler for the Ryzen 9 9900X?

The supplier description states the cooler is not included, so a separate AM5-compatible cooler must be purchased.

Which DDR5 speed should I target for the Ryzen 9 9900X on this board?

The CPU officially supports DDR5-5600 while the motherboard can reach DDR5 8400+ MT/s when overclocked; choose a kit rated for 5600 MT/s or higher.

What does the 5.6 GHz max boost mean for everyday workloads?

The 12-core, 24-thread processor can hit 5.6 GHz on lightly threaded tasks, delivering strong single-thread responsiveness while the 64 MB L3 cache helps multi-thread throughput.

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