Overclocking AMD motherboards can normally also deal with XMP memory.
Ryzen likes certain characteristics of RAM more.
It is better to buy RAM after you have chosen a motherboard.
If you go to the motherboard support page, you will find lists of supported processors and validated memory.
If a CPU is not supported since the first BIOS for a motherboard hardware revision you might need another processor to update it.
Online sellers might not state the hardware revision, much less the BIOS version installed.
The package should normally indicate the hardware revision, but maybe not the BIOS version.
New BIOS versions can add or improve RAM support.
It seems the GPU shortages are localized.
Ryzen likes certain characteristics of RAM more.
It is better to buy RAM after you have chosen a motherboard.
If you go to the motherboard support page, you will find lists of supported processors and validated memory.
If a CPU is not supported since the first BIOS for a motherboard hardware revision you might need another processor to update it.
Online sellers might not state the hardware revision, much less the BIOS version installed.
The package should normally indicate the hardware revision, but maybe not the BIOS version.
New BIOS versions can add or improve RAM support.
It seems the GPU shortages are localized.