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Well dark Angel:
"There's your answer, folks. Keeping to stock voltages and using a non-reference air cooler (a £30 Arctic Cooling Freezer Xtreme), we were able to apply a 20x multiplier and hit 4GHz across all six cores."
Using a Phenom II X6 1090T on a well known review site that i dont think i can link.
Just FYI - Max temp for these chips is 62Degrees C so we got more headroom than the 9x5's.