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ASUS PRIME B650M-K-CSM micro ATX motherboard, black PCB with silver heatsinks

ASUS

ASUS PRIME B650M-K-CSM AMD motherboard

SKU CH-AESS-F4HJT

Micro-ATX AM5 board with DDR5 support, dual M.2 slots, 2.5 Gb LAN, USB 3.2 Gen 2 ports, front USB 3.2 Gen 1 Type-C, BIOS FlashBack and Aura Sync RGB lighting

  • CPU Socket TypeAM5
  • AM5 socket readies the board for Ryzen desktop processors
  • DDR5 memory support with OptiMem II routing improves overclocking stability
  • M.2 PCIe 5.0 slot enables ultrafast storage connectivity
  • Realtek 2.5Gb Ethernet plus USB 3.2 Gen 2 ports deliver high-speed networking and peripherals
  • VRM, M.2 and PCH heatsinks with Fan Xpert 2+ provide comprehensive cooling

AM5 micro-ATX board for Ryzen builds

The ASUS PRIME B650M-K-CSM uses the AM5 socket to support current AMD Ryzen desktop processors in a micro-ATX form factor. It provides two M.2 slots, one wired for PCIe 5.0 speeds, plus DDR5 memory support and Realtek 2.5 Gb Ethernet. The board includes BIOS FlashBack for firmware updates without a CPU installed.

Check CPU cooler clearance and front-panel headers

Verify that your chosen AM5 cooler fits the micro-ATX layout and does not obstruct the VRM heatsink or the single M.2 heatsink. Confirm your case provides a front-panel USB 3.2 Gen 1 Type-C connector to use the onboard header. Ensure the power supply delivers an 8-pin EPS connector for the CPU voltage regulators.

Fits compact cases, frees rear I/O space

The micro-ATX dimensions suit smaller chassis while still offering two M.2 slots for fast storage without occupying drive bays. Onboard Addressable Gen 2 and standard RGB headers let you add lighting strips without external controllers. Fan Xpert 2+ and hybrid fan headers centralise cooling control, reducing cable clutter inside the build.

Highlights

  • AM5 socket readies the board for Ryzen desktop processors
  • DDR5 memory support with OptiMem II routing improves overclocking stability
  • M.2 PCIe 5.0 slot enables ultrafast storage connectivity
  • Realtek 2.5Gb Ethernet plus USB 3.2 Gen 2 ports deliver high-speed networking and peripherals
  • VRM, M.2 and PCH heatsinks with Fan Xpert 2+ provide comprehensive cooling

Specifications

CPU Socket TypeAM5

Questions about this item

Does the ASUS PRIME B650M-K-CSM come with a CPU, cooler or memory, or must they be purchased separately?

The board ships without a processor, cooler or DDR5 modules; you will need to buy an AM5 Ryzen CPU, a compatible cooler and DDR5 memory separately.

Should I choose the single M.2 slot that runs at PCIe 5.0 or the second slot for my primary drive?

Use the PCIe 5.0 M.2 slot for the operating system or performance-critical drive; the second slot provides additional storage capacity.

What real-world benefit does the 2.5 Gb LAN give compared with standard gigabit on this motherboard?

The 2.5 Gb Ethernet controller can move roughly two and a half times more data per second than 1 Gb LAN, reducing transfer times for large files and backups.

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