NO exact details from me but what I read in other forums Compute sets GPU (priority) for Bitcoin Mining while Graphics is gaming/dtp etc.
AMD Whitepapers ?
I could not find any explanation on AMD site or change logs. I am curious, that's all.
I did some testing with the latest drivers and it looks like 3D performance is not affected by this setting, only the computing (not only mining). Personally, I am leaving this on "Compute" because it looks like other apps can benefit. It still doesn't explain the "HOW".
GPU workload is to switch from gaming to mining digital currency like Bitcoin, Ethereum or Monero.