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I want to add one more GPU to my system. This GPU requires an 8-pin PCIE power connection but I'm all out. I am currently powering a GPU with two 8-pin cables each of which terminates in a 6-pin plug. So, I have 2x 6-pin plugs available. What I want to do is use a 2x 6-pin to 8-pin adapter to power the 2nd single 8-pin GPU.

In pictures - two of these cables powering two GPUs in parallel:

enter image description here

Two 8pins powering one GPU, and two of the 6-pin ends going into this adapter to power the second GPU:

6pin adapter

Disclaimer: I understand that this is a fairly unorthodox method but I also know that 8-pin PCIE is rated to 150W, 6-pin to 75W, and PCIE slot to 75W. So in theory I'll have less than 300W draw on 300W spec plus there's PCIE power. I have an IR thermometer I can use to monitor wire temps. Is there a flaw in my reasoning, am I overlooking something? Can I do this safely?

Hardware info: PSU: EVGA G2 Gold 1000W (single rail) GPU1: ~142W draw / 166W TDP GPU2: ~110W draw / 120W TDP

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    Just so long as the right voltage/current is provided by the connector pins and your PSU can handle the draw the only way you'll know is by trying ;)
    – Kinnectus
    Jun 23, 2017 at 14:44
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    You can splice a connection as many times as you want so long as your voltage and amperage of the PSU support your load.
    – Eric F
    Jun 23, 2017 at 14:53

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So I tried doing this and it has been stable and working. Wires do not get warm at all. YMMV so do it at your own risk.

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