Hi, my C6H is finally up and running.
The custom cooling loop costed one weekend. Lesson learned: Not all O-rings are the same even if they are looking like the same.
Running the Rzyen 1700X, 4 Sticks of DDR4 ram (Avexir Core Series Red Led DDR4-2400, CL16 32GB kit) designed for Intel quad channel (I know, not the best choice for Ryzen) , M.2 disk TeamGroup T-Force Cardea 480GB and a EVGA Geforce 1080.
I'm running the BIOS 0038. For the next time I'm not planning fancy things like OC or led light stipes. At the moment I'm happy that the system is running stable and the custom water cooling loop is properly controlled over PWM signals. The RAM is only stable running at 2133. For the moment I can live with that. As all C6H owners I'm waiting for a improved BIOS from Asus. The M.2 disk is properly shown in the BIOS.