I have the same issue, but with a Quadro P4000 video card.
Both the Quadro and GTX 1080 EXOC are NVIDIA cards, are Pascal-based, and have the GP104 GPU. Maybe Speccy will be updated to have these GPUs or the Pascal architecture included in its database (or in whatever place such information would need to be) sometime?
Like chorabr, I use Windows 10 Pro x64, v. 1703.
The entry above you suggested for chorabr PATH gives me a "No instance(s) Available" result, but I'm guessing it's because the entry is for the 1080 card. I tried it anyway just to see what I'd get.