I thinks this is more a PSA, do not install lastest drivers because it'll make memory controller load stays at 100% usage all the time, at least on RX 580.
It was measured using MSI- Afterburner. I uninstalled it and tried GPU-Z with the same result.
I'm using an AMD Radeon™ RX 580 GTR XXX Edition 8GB White (RX-580P8DFWR).
So far, the best solution I found was going back to Radeon 17.1.1, which is the last available through Windows Update.