After seeing this video, I attempted the project.
And then reattach the ethernet and USB connector.
I used a [650W Power Supply] which came with a 20+(4 pin) which I disconnected the 4 pins to connect with the 20 pin connector on the eGPU. The CPU 4-pin connector powers the eGPU. And the two GPU 6 pin connectors power the graphics card. I can use the power switch on the power supply to turn on/off the graphics card.
In the end, the NVIDIA 680 did work but I kept getting BSODs (blue screen of death). I feel like a newer graphics card would have done better but they aren’t available right now at even reasonable prices.