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I got one of the very early 3900x directly via amd. Since July I am, like others, working out Ryzen2.

System:
Ryzen 9 3900x /noctua nh-d15se
Asus C7H
4x8192 DDR4 3600 Trident Z RGB
Gigabyte...

For me the c7h and the 3900x are working like a charm. Im still on 2406 and everything works fine. max boost was 4625 Mhz on a single core and I get 73xx when its 28 °C inside and 75xx when its 20°C...

C7H and 3900X works fine with 3600 Mhz TridentZ CL16. Do not install Ryzen Master. :)

Im here in this german forum and explained it a little more
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