it would help to give us more info about the rest of your rig. look at the upper right corner of this page you'll see the Rigbuilder link.
info about your resolution and what is your goal as far as fps. you mentioned about lightboost and i have no idea what that is but others might be able to chime in.
i only use 1080 60Hz and i don't bother measuring my fps with a 290 'cause even my old 7950 can max the game at my rez. what matters is that the gameplay is smooth. DX11, i oc my i7 to 4.5. with mantle i can turn HT off and put the chip to stock.