@Branko I've got a new modded bios and now I`m getting the following results with 5x Sapphire Rx470 4gb elpida (11256-21-21g):

27,1MH/s per card
power consumption (on the wall) 850w (5cards)

core: 1200MHz
Mem: 2080

It`s very stable, but I thin i could improve hash rates and reduce power consumption, however, i have no idea how to do it...

Can anyone help?

tks a lot!