Does Yosemite use a lot less electric the previous OS X versions?

I know this sounds like it might be a stupid question, so forgive me in advance if it is.

I upgraded my 2011 Mac Mini from Mavericks to Yosemite. I also have the iStats module which gives all kind of useful info.

I've noticed since the upgrade that the DC In setting has gotten much lower then it used to. Now it shows a DC In reading of 11.9v with my fan set at 3000rpm and my CPU at ~10% usage. Previously the voltage would be much higher with similar fan and CPU settings.

What gives? Was iStats incorrect before and correct now or the reverse. Is Yosemite somehow that much more energy efficient?

Any thoughts or am I just being silly.

madrag said:

3000 revs for the fan?
Is that a setting or the reading that you are getting?
(I ask this because my 2012 Mini is normally at 1800rpm).

OT: I haven't installed Yosemite, so I cannot answer.

Click to expand...

It's a custom setting I use for fan speed. I figure a bit higher speed and the extreme rise in temp when I'm transcoding video will be a little less severe.