@rednoW

[/quote]
flash your Vega56 with Vega64 liquid bios + apply reg patch. You'll be able to run mem 1100mhz
[/quote]

Flashed a : Sapphire.RXVega64.8176.170719.rom in all 4 cards.

Mem does reach 1000 , but power draw is huge (psu overload)
Did reach 900+900 = ~1800 on -20power -30 core
From 875 watts total with 4 cards to 950 with only three cards.... idle system uses 270 watts.
Per card from 150 => 230 watts
Had to reinstall the driver cause of crash, PITA that it auto enables crossfire on all 4 cards (initialising takes ages...) before it can be switched off..
Did make a reg patch with the xcel tool but the havent reaaly dug into the voltages yet, so maybe not the best patch i have...
Couldn't really continue cause card with monitor seems highly unstable , even at second (vega56) backup bios ... hope card is still ok. will flash it back to standard bios and leave it be as it was originally.

Any reg patch file you can send / point me to / recommend for the other 3 cards with lowest power draw ?
 
(i need to get this rig to work with 1200 psu...)

thanks !