Drivers 17.9.3: voltage still spiking up to 1.15V in DXVA (RX480)

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.