Wel let me tell you how far I get.
My Mainbord cant get lower then 1.9V DRAM
I have changed the DRAM timing like suggested
Set DRAM on 667MHz
Both settings CPU/NB 2200 from 2400 give same results.
The system starts with 4x4GB Kingston
But crashes in W10
Then I set the DRAM on 800MHz
all same settings and 2200-2400 CPU/NB
And also 1.9-1.99 DRAM V
In these settings the PC doesn't start, cant even enter BIOS, screen stays in sleepmode.