I noticed that the gpu usage reported by wattman and radeon overlay is not accurate.
Wattman & Radeon Overlay sometimes are getting stuck at 100% gpu usage , and when they are not stuck at this value the gpu usage is jumpy , like from 0% to 100% back to 30% etc.
If i use afterburner with "Unified GPU Usage Monitoring" enabled , then I am able to see the real gpu usage which is 40-50%.
I've never had this issue before , in fact this issue is happening only with 17.12.1 and 17.12.2.
RX 480 8GB
Windows 10 Pro 64bit
Radeon Adrenalin Edition 17.12.2
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