I just noticed that comment in the post of Ehume :

"At idle, Tmonitor64 thinks it is going at 9x, Real Temp GT thinks the multi is 18.5x and CPU-Z thinks it is 30x. Note that the voltages in ET6 and CPU-Z are below 1v, more in line with a multi of 9x than anything else"

That is all that matters for me.

Of course I admit that CPU-Z is not accurate anymore at idle on latest Intel generations, that is why TMonitor was developped.

That discussion is closed for me, I want everything but a never ending topic about what is the best method to read clock speed. There are as many methods as there are tools to read them.