If you have Sapphire, use Trixx to undervolt. It will show 0 for cclock and memclock but you can control undervolting and fans.
Been running this driver for almost 2 days. Most stable/accurate effective hashrate I've had since starting to mine.
If ethermine would stop having problems it would be even better.
What version of trixx? I instaled i think 5.0 and when run it a see that it dont show cclock and memclock soci turned it off.. also what i noticed when i run trixx is that program itself run very slow almost not realomding... but probably problem in version..