Guys, I just got my 6 Vega 56 cards... I wanted to power them with an EVGA 1600 G2 but I just don't have enough VGA power connectors! Do I really have to connect 2x 8-pin per GPU? Is that needed for mining?
Go to eBay, get the splitters, like this one:
https://www.ebay.com/itm/1-Pc-PCI-E-6-Pin-Femal-To-Dual-8-Pin-6-2-Pin-Card-Power-Adapter-Cable-PCIE-PCI/222615689892?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649They work well. I've used them on 1080 Ti and Vega (but I undervolt, I don't go crazy with TDP +120 or anything like that).
But if I were you, I think would think about a server PSU, maybe the DPS-2000 or DPS-2500 and a price-technology.com breakout board, 6-pin cables to PCIe risers, 6-pin cables to (2) 6+2 pin splitters for GPU. You'll need a pico psu as well and a 240v outlet OR a step-up transformer (search "ELC step up transformer" on eBay).
All of that is less that the EVGA 1600 PSU. Not that I have anything against EVGA - that's a solid PSU.