If you haven't explicitly enabled microcode updates for your distribution, then chances are good it's disabled. You should check into it. Most of the time that

If you haven't explicitly enabled microcode updates for your distribution, then chances are good it's disabled. You should check into it. Most of the time that just requires installing a package, but you might also need to rebuild initramfs. For NixOS, it's just a single flag in configuration.nix as usual.