how to install graphic card with pin concetors

If your card uses a 6 pin and an 8 pin, then the max it's ever going to look to draw from pcie power is 225W, and that is way above what a 1080 will ever draw without heavy overclocking. It uses 18AWG for the pcie cables, so your 1080 is going to be comfortably well below the stressing factor of the cable, even with all current over one set. 18AWG is the standard on most modern supplies, with 16AWG being used for super heavy duty applications. The Y split means you'll be pulling more current over one set of cables, but so long as they aren't super thin 20 gauge cables they will still be able to supply up to ~280W without any noticeable heat. From the PSU side of things, the power is all being generated on one rail anyway (as long as it's a relatively modern psu, atx 2.3+), so you won't gain any efficiency benefits.

Unless you're super heavily overclocking your gpu, it really shouldn't make a difference. I came across an article saying you shouldn't use just the Y split cable that came with the psu. Should I add a second just to take the load of the one cable? Right now I have it powered by 1 PCIe 6pin + 8(6+2) pin cable. I have an evga 850bq psu and an Asus Rog strix 1080 gpu.

How to install graphic card with pin concetors