Those 1.0+ GHz Turbo Core speedups sound plausible because even Interlagos (2.3 GHz in Cray, maybe more at top bin frequencies) will have 500 MHz turbo on all cores. Remember ISSCC numbers, where average integer apps use ~65% of TDP ( http://regmedia.co.uk/2011/02/24/amd...ower_usage.jpg )
So with turbo at active core counts<max core count there should be even more room than for loads with all cores active.
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