speedstep hardware coordination ,

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speedstep hardware coordination ,

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Within a quad core xeon (Harpertown or Clovertown) processor can I change the clock speed using enhanced speed step of an individual core?

My understanding is that this is not possible in processors before the Nehelem (Core 7) but I could be wrong.
I am using linux kernel 2.6.28 and have written a basic cpufreq governor to check if this is possible. And as per the results I apperantely can.

I need confirmation before I continue.

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