I am also wondering which points are important while connecting GPUs to PSUs, couldn't figure out if I gotta use all the pins or just pick one ( my card has one 6 and one 8 pins to power, i am not sure which one to use connecting with PSU.. or maybe both? )
Is there any article / or information about PSU jacks?
You must connect both the 8 and the 6 pins, also for the OP, they probably do not affect mining efforts, some cards just need more power than others specially cards that are factory overclocked, you might get some boost but i don't think its anything big, most 1070s will do the same range.
Well, must isnt exactly correct, but its recommended.
Some GPUs wont start without both connectors attached tho.
It depends on how much power your card will draw from the PSU. Its obviously safer to balance power draw on 2 connectors instead of 1. But if you underclock and mine something that isnt GPU core intensive (like ethereum) you could probably get away with only one 8x pin connector.
Dont do this if you dont know what you are doing tho, nobody likes a closed casket funeral