My Dell Inspiron 3847 Upgrades

Hello! Recently I upgraded a regular old desktop system I had a Dell Inspiron 3847. I wanted to use it for gaming and bought a few small upgrades. I bought 16gb of ram, a 250gb SSD, and a GTX1050ti. I wasn't impressed with its performance. I found a great deal on a GTX 1080 but, my power supply does not have an 8-pin connector. I did some research and I found the SATA to 8-pin connector. I am wondering if these actually work or not. If the SATA to 8-pin connectors work can someone please respond? Thank you!