Because it requires processor support, Intel and AMD do it different, and to make matters worse.. each vendor has changed their method multiple times.
Not only that, but it's also equally complicated gathering the supported speeds.
Many people also prefer to not scale the clock rate, as it effects performance, it's usually only a concern for laptop users (..battery life).
As I said, try toggling that sysctl.. raising/lower, and compare it with hw.cpuspeed.
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