Point taken but I will be using 1500 as I will push this with dual mining. Cards alone I expect 1200 watt and additional 300 for the system.
If you expect the system to draw 1500 watts a 1500w PSU is not nearly enough.....you will want at least 1800w. Pushing a PSU to its max rating will both lower the efficiency by a bunch, burn the PSU out more quickly, and most likely cause a bunch of crashes/hangs as the PSU will not be able to regulate its voltage properly at 100% usage. Thats on top of the instability you are building into the system by running too many cards on one board.
That looks like the Asus Prime H270 Plus...I see no supplementary power for all those PCI-E slots. Is that not a concern for your build running 8 cards?