UPDATE on MSI Twin Frozr Gaming X RX580 4GB cards with (Elpida Memory) 

Must set your timings:

Copy 1500 to 1625, 1750, 2000 for BOTH series of straps. TIMING ONLY, no other changes
Then if using windows, modify memory to 1950 and core to 1088 for 28.045mh per card!

Total System(6 card): 168.2mh @ 996w

We will be doing so more adjustments and see what we can achieve, but for now, this will run overnight.

In Reference to video