Yesterday I updated drivers and in Crimson settings appeared me a new switch called Power Efficiency. I activated it out of curiosity but now can not get off. Sometimes when "I disable it" I go out and I get back into the configuration and reappears on, sometimes directly disappears switch to click and sometimes even the switch does not appear. I have also tried to restore the default values but does not work. Is there anything I can do other than reinstall the drivers? Or that option does not change anything now and I do not see differences?
My graphics card its a R9 270.
(Sorry bad english, Google Translate)
Your card does not need the Power Efficiency Toggle.
It showing up with your product is a bug which will be addressed in an upcoming driver release.