Recent leaks assert that NVIDIA has developed a new 12-pin connector that will supercede the 8-pin PCIe component often seen today. Now, a tipster claims to have been given the cables that go to this newer option. According to its images and rumors, its size is comparable to that of the current standard, but can be used to draw much more power.
https://www.notebookcheck.net/NVIDIA-s-new-12-pin-power-connector-for-RTX-3000-cards-is-spotted-in-the-wild.489514.0.html