You seem pretty knowledgeable regarding the engineering sample CPUs so if you wouldn't mind I would like to ask a few questions.
The base clock is 2.2Ghz with boost to 2.6Ghz, should you be able to set 26 as the max multiplier?
Do you see any reason you wouldn't be able to BLCK overclock these ES CPUs?
I ask because being limited to a x22 multiplier means that a base clock of over 180 would be required just to reach 4Ghz. I BCLK overclocked an i5 6400 and it was stable at 4.4Ghz (163 or 164 base clock I can't remember) at only ~1.25V, but bumping up the multiplier by just 1 caused issues no matter the voltage (boot but with no monitor output, wasn't boot looping). I am guessing this was likely due to my motherboard not having an additional clock gen like manty Z170 boards do (I was using a MSI Z170A PC MATE).