6GHz is possible for a very leaky chip (intel throws away the leaky ones) as the leaky cores are very good for LN2 overclocking. it would most likely be an ES chip selected by a performance engineer at intel for a PR stunt.
chips in retail channel are binned for air/water OC not sub zero
hint, the best OC chips like 6ghz i7's are thrown away for being flawed.
6ghz is very possible but benching 6ghz is not... unless you have some very impossible connections at intel.
also I have noticed in CPUz 1.51 where i have validated flawed results in some cases 500MHz higher than what the actual chip was running (i7 975XE ES)
it is a problem with bios reading higer than normal BCLK
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