So i'm using a Xeon 1265L on my HP gen8. Switched from Performance and 2400mhz to Conservative with 1600mhz. The thing is... i don't see any improvement in Powerdrain. According to my Powermeter the server was using 46-50W in Idle. I'm seeing the exact same behaviour now.   root@NAS:~# grep MHz /proc/cpuinfo cpu MHz : 1600.000 cpu MHz : 1600.000 cpu MHz : 1600.000 cpu MHz : 1600.000 cpu MHz : 1600.000 cpu MHz : 1600.000