if you are using windows - miner control seems to be perfect for that ... i dont have a windows machine - but that is one of the packages you can use ...

have a look at the article here - http://cryptomining-blog.com/5256-updated-miner-control-1-6-4-software-kbomba-edition/ ... and the latest source here - https://github.com/KBomba/MinerControl/ ...

if you are on linux ( which i am ) then it is a little more complex - but can be done ...

#crysx