Question about ASUS GeForce GTX 1070 STRIX O8G GAMING

There are quite acceptable power supply computers online...just google power supply computer, type in components..and see what it spits out....

Depends on what else is in the PC. Out of caution, I would now take an 850w power supply.

I will soon be building a PC for a colleague that will run with two 1070 Strix in SLI. I have planned for an 850W power supply, as the 970 Strix can already burn up to 300 watts (I have an Asus GTX 970 Strix, Intel Core i7 4790K (4.4GHz) installed in my own computer, which also runs on an 850W power supply).
In general, if you don't save too much on the power supply, it's easier to upgrade the PC later! So in this case I would recommend the following power supply (I have installed it several times and it runs perfectly without problems): be quiet! POWER ZONE (850W) (https://www.digitec.ch/de/s1/product/be-quiet-power-zone-850w-pc-netzteil-631907)
I hope I could help :)