Question Can’t find connector for 15 pin on a sata pci express cable

Jul 27, 2022
I recently bought a “SATA 8-Inch 15-Pin to 6-Pin PCI Express Card Power Cable” so I could plug my new 1060ti graphics card into my pc. The problem is I can’t find anything to plug the 15-pin side into. I have an Inspirion 3668 dell and the only other upgrade i’ve made to it was a cpu upgrade.

Any help with where I can plug this into or what I need to buy so i can plug this in is appreciated, thanks!