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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 socketAM5
  • 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.

How it compares

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

Price $831.99
Pricier than about 80% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME B850M-K+R7 9850 × 3D
Processor
CPU socketAM5

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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