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Run regedit (Windows Registry editor) and search for all occurrences of EnableULPS and change its value from 1 to 0.
You can press the F3 key to find the next occurrence. Make sure to change all of them. Then restart your computer and all should be fine. ULPS is AMD's power saving technology which is known to cause this issue.
Thanks man you solved the problem, it even improved the other two gpu's performance!. a