You know, 20-21MH/s for 274$ is pretty bad. I mean i got my r9 380 for less than 200$ and it do 20-21. Any AMD card will be better
This card is running in my "main" computer , Im not Using just for ETH mining. During night time can be a nice addition to my ETH mining rig as a extra 20MH/s

Im using RX 480 cards for mining