i believe most x99 chips get to 4.5 but getting 4.7 is lot lower percentage
i can get 4.6ghz on my 5930K but 4.7 fails, probably due to the 32gb ram

. maybe i got a bad Memory controller, also i never went over 1.3 i got 4.6ghz on 1.288V
also its not really worth it over 4.5 to be honest unless for Epeen