Mining Ethereum with one RX 470

Hello guys,
a few days ago I bought one of the last RX 470 for 280€, which is around 310$.

It is my first card which is only for the use of mining. On the internet I have read that this RX 470 Nitro from Sapphire with 4GB VRam from Hynix will achieve 31MHash on Ethereum. And then you can even undervolt it. I have BIOS modded and overclocked it so I get 27-28MHash on Ethereum. And everytime I try to undervolt it it will crash after one hour. I now get a few bucks more a day. At the time before getting this RX 470 I mined with an R9 380 which I overclocked to giving me 20MHash on Ethereum. Now I mine with my two GPUs with 47MHash which gives me about 0.025 Ethereum a day. Which is around 8$ a day, but that is going higher in the future, because i think Ethereum can and will go up to more than 500$. So i will hold most of my Ethereum and will exchange some of it for Steem.