@omenPSU , welcome to the forum.
First, let me say that you are a great friend! I would like the RTX 3080, myself.
I have searched everywhere that I can think of with no success. I am a bit concerned that the GTX 1080 Ti only uses a 2x4-pin and 2x3-pin connector. Normally, they are 2x6+2-pins for the 8-pin connector. HP has their components made to their specifications. So, I am not confident in saying that you will be safe buying the 3080.
Your best option is, unless someone with the PSU answers your question, try to figure out a way to discuss your friends computer with him and making reference to the PSU's PCIe power connectors (Dongles).


I am not an HP Employee!!
Intelligence is God given. Wisdom is the sum of our mistakes!!