sapphire nitro fury, clock @ 1100, -100mv.  You should mod it to be -150mv or more (test it out), plus bring the memory clock to 400 or even 300.  I just have one, its on my gaming computer and so it mines during the night.  I'm actually mining zec with it.  dual mining uses too much electricity, its too hot in my room   drivers are 16.6 or 16.11.x or something like that cant remember.  I have a 470 that mines on that computer too.  maybe try with 16.3.2 drivers, i think thats the best.