I have 6×1080 and 1× 1080 Ti in my mining rig.
I got recognized only 6×1080, the last 1080 Ti doesnt work.
Any ideas how to enable the 7th GPU??
Other miners works with 7 gpus.
Try updating your driver. I've read, that older nvidia-drivers didn't support the 1080 ti. Support started somewhere 384 or 387 I guess.