you should have gotten an r9 290. Unless you play 24/7, the difference in electricity bill isn't much. I think there's only a 50w difference between a 280x and a 290. If you were to play 8 hours a day, it would cost you about $2 more a month. LOL.
Anyhow, the msi 280x is quiet. However, I have had the fans fail on 2 of my msi 280x. It's good. It just isn't 290 good.