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ASUS PRIME B850M-K mATX motherboard with Ryzen 5 9600X CPU in AM5 socket

ASUS

ASUS PRIME B850M-K + Ryzen 5 9600X AMD motherboard & CPU combo

SKU CH-8QJR-A6RCH

A ready-to-build AM5 platform pairing a 6-core 12-thread Ryzen 5 9600X with a micro-ATX B850 board that delivers DDR5 8400 MT/s support, three M.2 slots up to 128 Gbps, PCIe 5.0.

  • CPU Socket TypeAM5

Motherboard PRIME B850M-K

Struck-through versions exist but are not stocked here.

CPU + Ryzen 5 9600X

  • Ready-to-build combo with Ryzen 5 9600X CPU included
  • Stable power delivery via 8+2+1 phase VRM on 6-layer PCB
  • DDR5 memory overclocking headroom up to 8400 MT/s
  • Three M.2 slots provide up to 128 Gbps total bandwidth
  • 5 Gb Ethernet and USB 10 Gbps Type-A for fast wired connectivity

Combo ready for AM5 builds

This bundle pairs an ASUS PRIME B850M-K motherboard with an AMD Ryzen 5 9600X processor. The CPU delivers 6 cores and 12 threads based on the Zen 5 architecture. A max boost clock of 5.4 GHz and 38 MB cache support high frame rates. The board uses the AMD B850 chipset and AM5 socket.

Suits DDR5 systems needing PCIe 5.0

Builders who want DDR5 memory up to 8400 MT/s and a PCIe 5.0 graphics slot will benefit. The 2.5 Gb Ethernet and rear USB 10 Gbps Type-A port help fast transfers. Users requiring integrated graphics or Wi-Fi should check specifications before ordering. The micro-ATX form factor fits smaller cases.

Fits mATX chassis with DDR5 and M.2 storage

The 6-layer PCB and 8+2+1 power modules feed the CPU steadily. VRM heatsinks, an M.2 heatsink and 4-pin PWM/DC fan headers manage thermals. Three M.2 slots provide up to 128 Gbps bandwidth for drives. A front-panel USB 5 Gbps Type-C header adds case connectivity. Aura Sync and addressable ARGB headers allow lighting control.

Highlights

  • Ready-to-build combo with Ryzen 5 9600X CPU included
  • Stable power delivery via 8+2+1 phase VRM on 6-layer PCB
  • DDR5 memory overclocking headroom up to 8400 MT/s
  • Three M.2 slots provide up to 128 Gbps total bandwidth
  • 5 Gb Ethernet and USB 10 Gbps Type-A for fast wired connectivity

Specifications

BrandASUS
ModelPRIME B850M-K+R5 9600X
CPU Socket TypeAM5

Other versions of this model

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Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

What DDR5 memory speed must I already have to reach the board's 8400 MT/s overclock target?

You need DDR5 modules rated for at least 8400 MT/s; the board will run them at that speed when the EXPO profile is enabled in UEFI.

Will my existing PCIe 4.0 graphics card work in the board's PCIe 5.0 slot?

Yes, the PCIe 5.0 slot is backward compatible and will run a PCIe 4.0 card at its native speed.

How can I verify the Ryzen 5 9600X is hitting its 5.4 GHz max boost clock after assembly?

Open the UEFI or a monitoring tool in Windows and confirm the core frequency reaches 5.4 GHz under single-thread load.

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