Intel processor always at top speed? Windows 8 doesn't enable SpeedStep?


Been using Windows 8 x64 RTM for over a month, and I realized the processor is always at "top" speed. No matter is <1%. Thus consuming more power and generating more heat. :S

Is this a Windows 8 bug? Missing drivers? I know the processor and the computer has this feat since I previously had Windows 7 and it used to run slower whenever it didn't have workload.

System: Lenovo S430 (Sandy Bridge) Intel i5 3rd generation; Windows 8 x64 RTM.


PD: Also, in Power options I don't see anymore the max/min processor % like Windows 7 used to have. Is this normal?

October 20th, 2012 5:52am

Hi, thanks for your reply.

Mhmmm... This is a processor feature. So it can't be related to Lenovo drivers. Also, a "clean" Windows 7 installation or even Linux detects SpeedStep without additional [Lenovo] software and slows down the processor...

I can only think of two possibilities: Windows not detecting lack of activity, or Windows not detecting processor features. The second one could be related to the processor drivers. But that would mean Windows 8 cannot detect an i5 features... That's kind of basic feat. It seems strange.

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October 20th, 2012 6:32pm

Thanks for your reply.

Yes, it is indeed. And I totally agree... the interface and documentation regarding BIOS setup is... "particular". Anyway SpeedStep and CPU power options are active.

Strange thing: I started paying more attention since yesterday and left the monitor open 24/7. Then I noticed that after a restart, SpeedStep started working. But when I woke up this morning it wasn't. Now it's working again...

No event in the log...

Grrrrr. :'(

October 20th, 2012 9:13pm


I wasn't running any VM at that moment.

Anyway, the issue disappeared just as it had appeared: without any reason. I blame some BIOS malfunction.

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November 13th, 2012 7:12pm

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