Is this a GPU or CPU Cable?

This is my first time trying to upgrade my pc, but when I opened it, turns out there was no pcie cable thing in my gpu (its a 3050 6b so its powered by the motherboard) so I was disappointed that I bought this rtx 4060 for no reason

But then I saw these cables in the corner of the case, and they look like a gpu power cable because it has 6 slots + 2 BUT it says “P4” on the cable. Doesn’t that mean it’s a cpu cable? Im sorry if I sound stupid