The 290X will do that for you no problem at all bud, try not the listen to the guys saying it'll melt your rig with it's running temps or take off because the fan sounds like a jet.
It's simply not true, yes, the card runs hotter than 780gtx's with non ref coolers

, but that to be expected when buying a card with the reference coolers, how hot does the 290X run? it'll run about 95c if you play Furmark on 20% fan speed.
If your sensible, set the fan @55% the card doesn't get close, idles temps on mine are 30-35c with max reaching between 72-82c on bf4, which is much more gpu intensive than arma 3.
As for noise, the fan is no louder than the His 6950 it replaced, sure if you wap the fan to 100% it's too loud, but every damn card is the same, at 55% which i set for gaming, it can't be heard over the speakers i use which aren't set that loud at all.
I'll happily make a vid for you if you'd like to ease your mind.