30 Fps is fine for gaming even a ps3 runs at 30fps.
I have the r7 240 the same card and high settings 30fps is perfect i play Star Wars Battlefront on medium with 30fps and Battlefield 4 high settings on 30fps. With 30fps you won't see stutters if you go below 20fps than i should recommend go lower on settings because playing games below 20fps you will notice alot of stutter and believe me its annoying to play games with stutters.