Asus PRIME B840M-K Motherboard - 90MB1PK0-M0EAY0

Name: Asus PRIME B840M-K Motherboard - 90MB1PK0-M0EAY0
Brand: Asus
SKU: hefj7qwvsc
Availability: InStock

The ASUS PRIME B840M-K AM5 micro-ATX motherboard is built for AMD Ryzen 9000, 8000 and 7000 series...

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Asus Prime B840m-K Amd B840 Socket Am5 Micro Atx

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Product Information

Full details

The ASUS PRIME B840M-K is a versatile micro-ATX motherboard designed for PC builders who prioritize stability and performance when using AMD Ryzen 9000, 8000, and 7000 series processors. It offers essential modern features like DDR5 memory support, PCIe 4.0, and 2.5Gb Ethernet, making it an excellent choice for productivity workstations and mid-range gaming rigs, though it lacks built-in Wi-Fi connectivity.

All features

Model Part Number	90MB1PK0-M0EAY0
Brand	Asus

Extended Product Information

FAQs

Does this board support Wi-Fi?

No, this specific model does not have integrated Wi-Fi. You would need to add a PCIe Wi-Fi card or USB adapter for wireless connectivity.

What is the maximum RAM capacity?

The board supports a maximum of 128 GB of DDR5-SDRAM across its two DIMM slots.

Can I use older Ryzen processors?

No, this board is designed specifically for the AM5 socket, which supports AMD Ryzen 7000, 8000, and 9000 series processors.

Does the motherboard support RAID?

Yes, it supports RAID levels 0, 1, 5, and 10 for both M.2 and SATA storage drives.

How many fans can I connect?

The motherboard features three dedicated chassis fan connectors to manage system airflow.

Troubleshooting

System fails to boot or POST.

Check that the 24-pin ATX and 8-pin EPS power cables are fully seated and that RAM modules are pushed completely into the DIMM slots.

Ethernet connection not reaching 2.5Gb speeds.

Verify that your router, switch, and Ethernet cables (Cat 5e or higher) are all rated for 2.5Gb speeds and that the latest drivers are installed in Windows.

RGB lighting not syncing via Aura Sync.

Ensure all LED strips or fans are correctly connected to the 3-pin RGB headers and that you are using the latest version of the Armoury Crate software.

Pros and Cons

Pros

Supports latest AMD Ryzen 7000/8000/9000 processors
Compact micro-ATX form factor fits most cases
Fast 2.5Gb Ethernet for high-speed networking
Supports up to 128 GB of high-performance DDR5 RAM
Integrated RAID support for flexible storage configurations

Cons

No integrated Wi-Fi or Bluetooth
Only two memory slots available
Limited expansion slots compared to ATX boards

Setup, Compatibility & Care

When setting up the PRIME B840M-K, ensure your case supports the micro-ATX form factor. Install the CPU into the AM5 socket carefully, ensuring no pins are bent. Since this board uses DDR5 memory, be certain your RAM modules are compatible with the DIMM slots. For storage, populate your M.2 slots before utilizing the four SATA III ports if you want maximum speed. For maintenance, keep the interior of your PC free of dust to allow optimal airflow over the motherboard components. Always use the latest UEFI BIOS updates from the ASUS support website to ensure compatibility with new CPU microcode and memory stability improvements.