Exactly. I use also...
But regarding to the Haswell, seems to me the more touted improvement is energy management. Very useful in portable and mobile devices. Not a too big issue in desktop computers. But can be useful to cut off the power bill, say, in a 10-15%...?......
In a OS X Terminal window:
sudo pmset -a disksleep 30
You can verify your settings via:
In a OS X Terminal window:
pmset -g custom
I've many external HDDs.
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https://dl.dropboxusercontent.com/u/574869/137419114-Introduction-to-AVX2-optimizations-in-x264.pdfWhat makes you think that?