Problem is (when CPU is OC'ed) that it is just running with the same multiplier all the time, in my case 43, which makes the CPU running 4,3Ghz also when idle on all 4 cores.
When default speed is set, the CPU clock down 1,6Ghz when idle, and then clock up and down pr core when there are jobs to be done. In windows 7 this also works when the multiplier is set to 43 in BIOS.
That's called Enhanced SpeedStep, and requires that you enable it in the BIOS, and set the maximum processor level. Also, Windows requires that you set the Balanced or Power Savings Power Profiles in Power Settings. If it's set to Performance, then it won't use it. You can create custom profile and set the percentage under the advanced power settings.
Yes, you're right about the settings, BUT ... as written earlier, the SAME BIOS SETTING is working when I boot into windows 7!! So I guess my setting in BIOS is quite similar to what you are writing. But it won't throttle down when booting into windows 8.
Look at this
http://www.eightforums.com/performance-maintenance/10789-cpu-not-clocking-down-when-idle.html
But don't spend more time on this. Next weekend I am going to reformat the SSD with windows 8 and use this SSD as a gamer-drive. I have heard from techsupport at Kaspersky. KIS2013 is NOT working completely under windows 8. My USB 3 performance is way to low in windows 8, and I still think it is so ugly. I have now only ONE tile on Metro, this tile is named "Desktop".
But thank you for your time and efford to make it work for me. I'm just to stupid to handle Windows 8, so I'll stay on the much easier Windows 7, for now at least.