What is Reddit's opinion of OwlTree Braided ATX PSU 8 Pin Male to Dual 8 Pin 6+2 Pin PCIe Male GPU Power Supply Splitter Adapter Cable ONLY for Corsair Modular Power Supply 23.6inch + 5.9inch Tinned Copper Wire 18AWG?

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Here ya go.

I am not aware of any power supply that has 3. You can just purchase an additional one like this one:

https://www.amazon.com/OwlTree-Braided-Splitter-Adapter-23-6inch/dp/B099W6CS3C/ref=sr\_1\_8?crid=3EYMJETFFKIQ6&keywords=8+Pin+Male+to+Dual+8+Pin+6%2B2+Pin+PCIe+Male&qid=1656519455&sprefix=8+pin+male+to+dual+8+pin+6%2B2+pin+pcie+male%2C...

First, for the end that plugs into the PSU:

Looking at your PSU, the connector that plugs into the PSU is 8 pins.

The cable you linked from BestBuy shows 12 pins on the PSU end, so that won't work. In fact, as I look at my PSU and a few others, I don't see any that use 12 pins.

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Second, for the end that plugs into the GPU:

AMD lists under specs for the 6700XT "Additional power connector: 8 pin + 6 pin"

On this MSI 6700XT, I see two 8-pin connectors, which seems to be standard. Look at your GPU and see if it's similar, or if there's possibly one 8-pin and one 6-pin. If so, you might want a cable like this that has 6+2 ends so you can just leave one of those 2's hanging if it isn't needed in your GPU.

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Disclaimer: I'm not an expert and have only built one PC in the last 20 years. The cables that came with my PSU worked with my GPU so I didn't have to think much about it.