Short story, i have an sapphire radeon hd 7790 and an amd fx 8320.I know they are old, but i have installed the latest amd adrenalin driver (radeon software 17.12.2), and in games the cpu utilisation is always 0%.Also i use windows 10 pro 64 bits edition. Is there anyway to fix this ? Ihaveen on a pc of a friend of mine its working properly but he has an intel (i5 7400) and rx 480.
I'm not really sure why this is happening, so it's not a great answer, but I think it is related with the lack of support for certain CPUs and chipsets.
Probably they will add support for more systems (who knows)