Which is better for a Ryzen 7 or Ryzen 9 build?

The GIGABYTE. Its 10+3 phase power design is built for higher-core chips, while the ASUS Prime B550M-K has a basic VRM better suited to Ryzen 5 and below.

Do either of these have WiFi?

No. Neither board lists built-in WiFi, so plan on a PCIe WiFi card or a USB adapter, or use Ethernet.

Which has more storage options?

The GIGABYTE, with two PCIe 4.0/3.0 x4 M.2 slots. The ASUS Prime B550M-K lists one M.2 slot.

Is the GIGABYTE worth the extra over the ASUS?

At $103.98 at Walmart as of November 7, 2026, the GIGABYTE adds a second M.2 slot, a front USB-C header and stronger power delivery. If you only need one drive and a small case, the ASUS is enough.

Will either fit a micro-ATX case?

Only the ASUS Prime B550M-K. The GIGABYTE is full ATX and needs an ATX case.

Do both support 128 GB of DDR4?

Yes. Both have four DIMM slots, 128 GB max and ECC support.

Gigabyte B550 Gaming X V2 vs ASUS Prime B550M-K

The GIGABYTE B550 Gaming X V2 is the better pick for most builders: full ATX, stronger 10+3 power delivery, two PCIe 4.0 M.2 slots and a front USB-C header. The ASUS Prime B550M-K is the cheaper, smaller choice for a compact micro-ATX build with a modest CPU. At the latest prices, the GIGABYTE is $103.98 at Walmart as of November 7, 2026, and the ASUS has no price given here.

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