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It’ll be compatible with 5 Gbps devices, but if you’re intentionally looking to restrict even 10 Gbps devices down to 5 Gbps for some reason, you might be able to find something in your BIOS that lets you do that, or you can get a USB 3.0 extension cable that’ll limit your speeds to 5 Gbps.
Really I think a temporary dual boot to test everything would be the sanest option, and then when you’re ready to commit, back up your home folder and repartition your drive accordingly. If you end up never ready to commit, well, second-gen Ryzen is officially supported on Windows 11 as long as you enable fTPM and Secure Boot in your BIOS.
Here’s a few pointers based on what I’ve found out: