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.
Thanks! I just got the two today and had totally forgot about Afterburner. I believe I might not have enough power to actually power the two unless I undervolt (which I am going to). Because without undervolting, their clock rate fluctuates even below stock. However, when I undervolt -96 but increase power limit, I can only go up to 1070MHz before it gets unstable. Very unfortunate. Oh well, at least I know what the next purchase will be.
When I undervolt, however, I do get 30.5 MH/s ETH and 610 MH/s PASC (dcri 40) per card though, so thanks!
Edit:
What kind of benchmark program is that?