[Bug 234733] Setting CPU frequency with sysctl dev.cpu.0.fr slows a Ryzen 2700X down

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234733

--- Comment #13 from Conrad Meyer <cem at freebsd.org> ---
Note that there are several newer BIOSes available for that board:
https://www.asrock.com/mb/AMD/B450%20Pro4/#BIOS

The only remark that really jumps out is for 3.31, "Change AMD PBO rule with
Pinnacle CPU."  PBO is "precision boost overdrive" and is something involving
power; Pinnacle is the ryzen 2xxx family.  That said, I'd just skip straight to
3.90 as long as you're taking the time to flash a new BIOS.

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