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Micro-ATX motherboard with installed Ryzen CPU, silver heatsinks, black PCB

ASUS

ASUS PRIME B850M-K Motherboard & AMD Ryzen 7 9850X3D CPU Combo

SKU CH-E07V-PR119

A motherboard and CPU combo featuring an 8-core, 16-thread Ryzen 7 9850X3D with 96 MB L3 cache and a B850 board supporting DDR5 up to 8400 MT/s, three M.2 slots at 128 Gbps.

  • CPU Socket TypeAM5
  • Ready-to-build combo with matched AM5 motherboard and CPU
  • 8-core 16-thread Ryzen 7 9850X3D with 96 MB L3 cache
  • Up to 5.6 GHz max boost unlocked for overclocking
  • DDR5 memory support up to 8400 MT/s overclocked
  • PCIe 5.0 slot and 2.5 Gb Ethernet for fast I/O

Combo Contents

This bundle pairs an ASUS PRIME B850M-K motherboard with an AMD Ryzen 7 9850X3D processor. The board uses the AM5 socket and a micro-ATX form factor. The CPU delivers 8 cores and 16 threads based on the Zen 5 architecture with a 5.6 GHz max boost clock. It is aimed at builders who want a ready-matched platform for gaming and multitasking.

Suitability

The combination suits enthusiasts who value the 96 MB L3 cache for gaming responsiveness and want DDR5 memory support up to 8400 MT/s when overclocked. It also fits creators needing three M.2 slots and a 2.5 Gb Ethernet port. Buyers requiring a stock cooler, integrated graphics, or a full-size ATX layout should consider other options.

Bundle Impact

The motherboard contributes an 8+2+1 power stage design on a 6-layer PCB with Digi+ VRM control for stable delivery. Thermal hardware includes VRM heatsinks, an M.2 heatsink, and 4-pin PWM/DC fan headers with smart protection. Connectivity adds a PCIe 5.0 slot, rear USB 10 Gbps Type-A, front USB 5 Gbps Type-C, Realtek 2.5 Gb Ethernet, and 2nd generation addressable ARGB headers managed through UEFI BIOS and Aura Sync.

Highlights

  • Ready-to-build combo with matched AM5 motherboard and CPU
  • 8-core 16-thread Ryzen 7 9850X3D with 96 MB L3 cache
  • Up to 5.6 GHz max boost unlocked for overclocking
  • DDR5 memory support up to 8400 MT/s overclocked
  • PCIe 5.0 slot and 2.5 Gb Ethernet for fast I/O

Specifications

BrandASUS
ModelPRIME B850M-K+R7 9850X3D
CPU Socket TypeAM5

Questions about this item

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

You need DDR5 modules rated for at least 8400 MT/s; the board supports up to that speed when overclocked, while the CPU officially supports 5600 MT/s.

Will my existing PCIe 4.0 graphics card work in the PCIe 5.0 slot on this motherboard?

Yes, the PCIe 5.0 slot is backward compatible, so a PCIe 4.0 graphics card will operate at its native 4.0 speeds.

How can I verify the 9850X3D is hitting its 5.6 GHz max boost after assembly?

Watch the CPU frequency in the UEFI BIOS or a monitoring tool while running a single-threaded load; it should reach 5.6 GHz if thermal and power headroom allow.

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