Thank you rednoW for sharing your reg file. Its the first where iam able to boot into Windows. Both Vega56 with 64 Bios runs at 2kh/s with ~140W for a minute or two and then the AMD Tool crashes or one GPU crashes and resets to default settings. Also if i reduce mem to 950mhz and rise voltages to 1100mV its unstable. Bad luck in silicon lottery?