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ASUS PRIME B850M-A micro-ATX motherboard with Ryzen 7 9800X3D CPU installed

ASUS

ASUS PRIME B850M-A & Ryzen 7 9800X3D AMD motherboard combo

SKU CH-RJZW-328FZ

Micro-ATX AM5 motherboard with 8+2+1 power stages, three M.2 slots, PCIe 5.0, 2.5 Gb Ethernet and bundled Ryzen 7 9800X3D 8-core CPU

  • CPU Socket TypeAM5

Motherboard PRIME B850M-A

Struck-through versions exist but are not stocked here.

CPU + Ryzen 7 9800X3D

  • Stable power delivery with 8+2+1 phase design and 6-layer PCB
  • DDR5 memory speeds up to 8000 MT/s overclocking headroom
  • Three M.2 slots providing up to 128 Gbps total bandwidth
  • Realtek 2.5 Gb Ethernet for fast wired networking
  • 8 cores and 16 threads with 96 MB L3 cache on Zen 5 architecture

ASUS PRIME B850M-A with Ryzen 7 9800X3D

This bundle pairs an ASUS PRIME B850M-A micro-ATX motherboard with an AMD Ryzen 7 9800X3D processor. The board uses the AM5 socket and a B850 chipset to support the latest Ryzen CPUs. The CPU delivers 8 cores and 16 threads based on the Zen 5 architecture. Together they form a ready-to-install platform for gaming and multitasking.

AM5 DDR5 platform with PCIe 5.0 and 2.5 Gb Ethernet

The motherboard provides three M.2 slots with up to 128 Gbps total bandwidth and a PCIe 5.0 expansion slot. Memory can reach DDR5 8000 MT/s when overclocked. Wired networking runs at 2.5 Gb via a Realtek controller. Front-panel USB includes a 5 Gbps Type-C connector. This suits builders who want modern connectivity in a compact board.

96 MB L3 cache and 5.2 GHz max boost

The Ryzen 7 9800X3D features 96 MB of L3 cache using second-generation 3D V-Cache technology for low-latency gaming. Max boost reaches 5.2 GHz and the processor is unlocked for overclocking. Base DDR5 support is 5600 MT/s. This cache size and clock speed are the key figures that define gaming performance.

Highlights

  • Stable power delivery with 8+2+1 phase design and 6-layer PCB
  • DDR5 memory speeds up to 8000 MT/s overclocking headroom
  • Three M.2 slots providing up to 128 Gbps total bandwidth
  • Realtek 2.5 Gb Ethernet for fast wired networking
  • 8 cores and 16 threads with 96 MB L3 cache on Zen 5 architecture

Specifications

BrandASUS
ModelPRIME B850M-A+R7 9800X3D
CPU Socket TypeAM5

Other versions of this model

5 more in the same range

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

Questions about this item

What comes inside the ASUS PRIME B850M-A and Ryzen 7 9800X3D combo box and what must I buy separately?

The box contains the PRIME B850M-A motherboard and the Ryzen 7 9800X3D processor. You will need to purchase DDR5 memory, storage drives, a graphics card, a CPU cooler, a power supply and a case separately.

Which version of the combo should I choose for maximum DDR5 speed and M.2 bandwidth?

This single combo specification supports DDR5 up to 8000 MT/s when overclocked and provides three M.2 slots with up to 128 Gbps total bandwidth, so no alternate version is required.

What does the 5.2 GHz max boost figure mean for real-world gaming on this CPU?

The 5.2 GHz max boost clock on the 8-core, 16-thread Ryzen 7 9800X3D combines with 96 MB of L3 cache and second-generation 3D V-Cache technology to deliver low-latency gaming performance at DDR5-5600.

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