my rx 580 only get 5mh/s minning ethereum

Hello friends, I have a problem. I wanted to mine ethereum with a rx 580 4gb and it is only generating 5 mh / s when it should generate at least 20mh / s. I have the latest adrenalin drivers

The DAG file for ethereum is about 3.88GB currently which is causing your card to struggle as its filling up your ram. Would suggest trying another currency if its something your interested in.