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ASUS B850M AYW GAMING WIFI micro-ATX motherboard with Ryzen 9 9900X CPU, black PCB and silver heatsinks

ASUS

ASUS B850M AYW GAMING WIFI AMD motherboard & Ryzen 9 9900X CPU combo 2.5Gb Ethernet

SKU CH-MH5P-TEEN1

A micro-ATX AMD B850 board paired with a 12-core Ryzen 9 9900X, offering DDR5 to 128 GB, PCIe 5.0 ready graphics, Wi-Fi 6, 2.5 Gb Ethernet and 7.1 audio

  • CPU socketAM5
  • 12 cores and 24 threads deliver high multi-threaded throughput
  • DDR5 dual-channel support up to 128 GB at 4733 MHz OC for fast memory bandwidth
  • PCIe 4.0 M.2 plus PCIe 3.0 M.2 and six SATA 6 Gb/s ports give flexible storage options
  • Wi-Fi 6 and 2.5 Gb Ethernet with Bluetooth 5.2 provide reliable wired and wireless connectivity
  • Realtek ALC1220 7.1 HD audio with ESS SABRE ES9218C DAC produces clear immersive sound

Combo for AM5 gaming builds

This bundle pairs an ASUS B850M AYW GAMING WIFI motherboard with a Ryzen 9 9900X processor. The board uses the AM5 socket and supports dual-channel DDR5 up to 128 GB at 4733+ MHz OC. The CPU delivers 12 cores and 24 threads with a 5.6 GHz max boost. Together they suit gamers and creators moving to the AM5 platform.

Suits high-core-count workloads.

The 12-core 9900X excels in rendering, compiling and multitasking alongside gaming. Builders needing only mainstream gaming performance should consider a lower-tier Ryzen 5 or 7. The micro-ATX form factor fits smaller cases but limits expansion to one PCIe 4.0 x16 slot plus reinforced PCIe 3.0 slots. No cooler is included with the processor.

Verify DDR5 memory compatibility

The motherboard accepts only DDR5 modules; older generations are physically incompatible. Dual-channel kits up to 128 GB total capacity are supported at speeds of 4733+ MHz OC. The CPU natively handles DDR5-5600. Selecting the correct DDR5 kit is the single specification that determines whether this combo works in your build.

How it compares

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

Price $663.99
Pricier than about 73% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model nameB850M AYW GAMING WIFI+R9 9900X
Processor
CPU socketAM5

Questions about this item

What case and power connectors does the micro-ATX B850M AYW GAMING WIFI need?

The board fits a micro-ATX or larger case and requires a 24-pin ATX plus an 8-pin EPS power connector; rear I/O includes HDMI 2.0b, USB 3.2 Gen2 Type-C and eight USB 3.2 Gen1 ports.

Which step do builders most often miss when installing the Ryzen 9 9900X on this AM5 board?

The CPU ships without a cooler, so you must mount a compatible AM5 cooler and connect its fan header before first boot; the socket uses a single-lever retention mechanism that clicks when fully seated.

Which storage drives can be added later to the two M.2 slots and six SATA ports?

One PCIe 4.0 M.2 slot and one PCIe 3.0 M.2 slot accept 2280 SSDs; six SATA 6Gb/s ports support additional 2.5-inch or 3.5-inch drives.

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