The absolute minimum for the graphics card with CPU etc. starts at 750 watts of power supply. I don't like to gaiz there and would only start at 1000. I got myself a 1300 Watt power supply.
According to NVidea you need at...
3070 1x PCIe-8-Pin
3080 2x PCIe-8-Pin
3090 2x PCIe-8-Pin
It can be assumed that at least for the 3070 and 3080 this refers to an adapter that is included with the graphics card. Especially with the 3070 you can clearly see the 12-pin connector.
The cable is not yet available for purchase directly from Cablemod. Not yet in the range.
And now the "funny" thing. All these specifications are for the Founders Edition of NVidea, what the third-party manufacturers use for the power connection can be completely different.
