I've just noticed a strange behavior regarding frequency scaling on the
Mac mini G4. When I tried to set the CPU frequency using powerd, it
(and "sysctl dev.cpu.0.freq") reports that the frequency has been
changed, yet a test using "openssl speed" shows similar performance
between the two frequencies.
Here's the result of running "openssl speed -evp chacha20" with
"powerd -n maximum" (1416 MHz):