I bought a new ASUS RTX 4070 SUPER OC.
Took out my old GTX 1060, connected the 12 pin PCIE adapter that came with the 4070-S to the 8 pin PCIE cable my 1060 was using, as well as another 8 pin PCIE I had laying around and had never used.
Inserted the 4070-S in, turned on the PSU switch and...