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ASUS PRIME B850M-A micro-ATX motherboard with AMD Ryzen 7 9850X3D CPU installed

ASUS

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

SKU CH-JQG9-AGMHH

AM5 motherboard and CPU combo with 8+2+1 power phases, three M.2 slots, PCIe 5.0, Realtek 2.5 Gb Ethernet, USB 5Gbps Type-C, DDR5 8000+ MT/s support, and Ryzen 7 9850X3D with 8 cores, 16 threads.

  • CPU socketAM5
  • Ready-to-build combo with matched Ryzen 7 9850X3D CPU
  • 8 cores and 16 threads for high-throughput workloads
  • 96 MB L3 cache cuts gaming latency
  • DDR5 up to 8000 MT/s overclock headroom
  • Three M.2 slots deliver up to 128 Gbps bandwidth

Combo Motherboard & Ryzen 7 9850X3D

This bundle pairs the ASUS PRIME B850M-A micro-ATX motherboard with the AMD Ryzen 7 9850X3D processor. The board uses the AMD B850 chipset on the AM5 socket and includes a 6-layer PCB with 8+2+1 power modules. It supports DDR5 memory up to 8000 MT/s overclocked and provides three M.2 slots reaching 128 Gbps total bandwidth. Connectivity covers a PCIe 5.0 slot, Realtek 2.5 Gb Ethernet, and front USB 5 Gbps Type-C.

Builders seeking high gaming frame rates

The included CPU delivers 8 cores and 16 threads based on the Zen 5 architecture with a 5.6 GHz max boost clock. Its 96 MB L3 cache uses second-generation 3D V-Cache technology to reduce latency in games. The motherboard adds VRM heatsinks, M.2 heatsinks, a water-pump header, and AURA SYNC addressable RGB control. Users who need integrated graphics, a bundled cooler, or Wi-Fi should consider other options.

96 MB L3 cache on the Ryzen 7 9850X3D

This large cache is the decisive specification for gaming-focused builds. It sits alongside 8 MB L2 cache and native DDR5-5600 support on the AM5 platform. The board’s three M.2 slots and PCIe 5.0 slot provide high-speed storage and GPU headroom. Verify that your chassis fits micro-ATX and that your power supply meets the CPU’s requirements before purchasing.

How it compares

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

Price $922.99
Pricier than about 84% of the 1,906 comparable items (median $224.49).

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Specifications

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

Questions about this item

How do I install the Ryzen 7 9850X3D into the AM5 socket on this PRIME B850M-A board, and what step do builders often miss?

Lift the retention arm, align the gold triangle on the CPU with the socket marker, lower the chip without force, then close and lock the arm; the step often missed is removing the protective plastic cover from the socket before seating the processor.

What maintenance or replacement will the Ryzen 7 9850X3D need later, given that no cooler is included?

You must supply a compatible AM5 cooler at build time; afterwards the only upkeep is cleaning dust from the cooler fins and fan, and replacing thermal paste every few years if temperatures rise.

What limit appears first when the 8-core 9850X3D runs sustained loads on this board's 8+2+1 power stages?

The CPU's 5.6 GHz max boost clock is the first ceiling you hit; the VRM design supports stable operation at stock speeds, so thermal limits from your chosen cooler become the practical bottleneck.

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