Lol yeah, that's why we went with the 470's, the power draw on these cards is actually surprisingly low.
I would hope so. My RX 480 crossfire setup draws way too power for my own good.
My r9 390 xfire with my fx 8320 oced to 4.7 pulled 875 at the plug under full load lol i think gaming it hovered at like 700 give or take. I'm still useing my Evga 1000w p2 to power my i7 6700k and Gtx 1070 so the fan never comes on lol
God... Mine only pulls roughly 500 at load I think. I haven't had much time to test that in depth.