x16r

[Bear in mind that X16R has a variable hashrate due to the ordering of the hashing algos]

Zotac 1080ti - 17.5mh/s - 23.4mh/s
Asus ROG 1080ti - 17.6mh/s - 25.2mh/s
EVGA 1080ti sc - 16.92mh/s - 22.9mh/s

Linux Ubuntu 18.01

No overclocking/underclock

Power limit at 180w - which is about 67% of total

Total for 2 x Zotac 1080ti + 2 x Asus ROG 1080ti + 1 x EVGA 1080ti sc is between 83mh/s and 120mh/s

970w total system

Could probably squeeze more out. Also should be noted that temps are the lowest I've seen on x16r

Lyra2z

Zotac 1080ti - 4250kh/s
Asus ROG 1080ti - 4098kh/s
EVGA 1080ti sc - 3960kh/s

Linux Ubuntu 18.01

No overclocking/underclock

Power limit is at 160w - which is about 59% of total

890w total system