Right ! After the lispy gopher show with screwtape (check the mastodon, ironically) I did set apmd at -L (lowest) clock settings. $ rcctl enable apmd $ rcctl set apmd flags -L $ rcctl restart apmd $ apm .. Performance adjustment mode: manual On the i386: (224 MHz) On the amd64: (800 MHz) So we are sub-gigahertz in both cases at least !