Thanks Man!
I’ll do the 3DMark/Timespy tests, give me some days, I’M quite busy these days 
I’ll think it’s enabled (Auto), because I got Single Core boost up to 4.8/4.9 GHz. But I’ll turno it on for the next tests (BTW: Mainboard is the MSI B550 Gaming Carbon WiFi).
Monitor Resolution is 3840 x 2160.
Latest Chipset Drivers (some days old now) and BIOS is installed.
@eklester tried Gaming Mode enabled and disabled, no changes (not ONE FPS) 