Yesterday I got 4 new MSI 1080 Hybrid cards.
I did a test render with my 4 x 780 TIs before and after swapping the cards.
Result:
780 TI's:
Time: 1:15:22
Temp: 50° C
1080's:
Time: 1:03:24
Temp: 42° C
Image:
PT, 5.000 Samples
Hope Cuda 8 support will improve performance.