Total mining noob here, but using a Sapphire Fury Nitro oc and thought I'd chime in

The two settings I go for are -96mv 1000mhz clock 500mhz ram and get 440 H/s using claymore. (Zcash)

I've got a lazy oc profile as well stock mv 1100mhz clock and 525mhz ram and I get 480 H/s (Zcash)

On those two profiles I didn't even try to find the limits yet either, I just dialled them in straight and they worked, could potentially push them further but haven't bothered yet.

Sadly as of yet I can't tell what my power draw is, also got another Fury on the way, managed to pick them up for the same price as a RX580.

Hope this helps