Bought a brand new 2008 G0 Q6600 (which came in a dark blue box), FPO L806A692 with a VID of 1.325V It was a rubbish clocker and needed 1.45V to get 3.2Ghz OCCT stable.
But I found a G0 on Ebay FPO L730B292 and 1.2625V VID (which came in a LIGHT blue box). This one does 3.4GHz at default volts, perfectly stable
Needs 1.34V to do 3.6 Gz but maybe able to reduce that by tinkering with VTT and GTL reference voltages.

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