Reporting first experience of the 3900X I bought from Alex ( cpu n.1 )
Asus Crosshair VIII Impact, G.Skill Neo 3800C14, custom water cooling loop.
Mems stock, very basic tuning.
4.65ghz with 1.325V, FCLK 1900, steady like a rock on CBR15, CBR20, Wprime 1024.
4.7ghz is possible with 1.385V with full stability, but it was too damn hot today ( 29c ).
I expect to see with fine tuning on DICE over 5ghz.
BIG thank you to Alex