AMD Graphics Card: Reference RX 480 8GB
Operating System: Windows 10 64bit
Driver version: 17.9.3, but same problem since 17.7.2
Application: PotPlayer with madvr
Like it says in the title, since 17.7.2 voltage is spiking to maximum WattMan value (1.15V for RX480) while watching videos. Idle and game profile voltages aren't affected.
This seems fixed in the latest beta drivers for Windows Fall Creators Update.