820H/s+ on 470 here.
Yeah... sure...
You just forgot to mention that you have custom modded memory straps and private optimized kernel.
Without going above 1180MHz core and using ETH straps on public miners (GG is the most stable for now) I'm not able to see more than 730H on 470
EDIT: wtf... my mistake... I've just replied to some ancient post
730 h/s is not to be spat on, the 470 is a relatively cheap card after all and it does much better than more expensive gpus.