Just got a pair of rx 580's I saw the "GPU workload" option for about 24 hours, but now it is gone, and no matter what driver I use, I can't get the option back. This is a deal breaker for me and unless I can get a fix, I'm going to have to go back to nvidia cards.
As soon as you post your computer Information as per AMD Forum rules : INFORMATION REQUIRED WHEN POSTING A QUESTION , then it might be possible for someone to help.
What version of AMD Driver are you using? Are the RX in Crossfire? Windows OS installed? MAKE & MODEL of Motherboard, CPU/APU & PSU?