Hi guys, recently I discovered a problem with my build. I'm using it mainly for rendering and when I put something to render, clock speed is slowly dropping and through some time it drops significantly, sometimes below 3.0GHz. I just don't understand why this is happening. Load temperature is stable 68 degrees Celsius. Any help or hint would be highly appreciated because I'm starting to go mad here. Thanks.
AMD Threadripper 1950x @3.4Ghz
Gigabyte x399 Aorus Gaming 7
Enermax LIQTECH TR4 360 (water cooled)
Corsair Vengeance CMK16GX4M1B3000C15, 2x16GB @3000MHz (XMP turned ON)
Gigabyte Aorus GeForce GTX 1080 Ti
Samsung 960 PRO M2
PSU: Corsair HX1000i (1000W)
Windows 10 Pro