17.5.1 R9 390X memory clock doesn't downclocking in idle

After updated 17.5.1 from 16.11.5 (yes, already tried DDU), I noticed that the memory clock always 1500MHz even if in idle. At least, downclocking worked properly on 16.11.5 and 17.2.1. Does anyone have the same issue?

 

  • Card: SAPPHIRE NITRO R9 390X with Backplate
  • Display 1: DELL U2414H via DisplayPort @59Hz
  • Display 2: DELL U2414H via HDMI @59Hz
  • Display 3: DELL U2414H via DVI-HDMI @59Hz