1080 graphic cards aren't a good choice for mining anymore, leave the old cards be for PC gamers because that's the best a 1080 graphic cards can do right now, they are still 1080p display champions.
Thats not true , if you have a 1080Ti with 11 GB Ram its still a good card for mining for a few Algos.
I bought mine straight after the Card was released i guess 5 or 6 years ago or something around that time , and it still mine without any problems.
Depends what 1080 Versions you have for sure , and old Cards dont wanted anymore for PC Gamers , they want also the best and new cards.
The GTX 1080 ti is much better at gaming, according to the test results. I think that the problem is only in the price of the GTX 1080 ti.