Widescreen Gaming Forum

This year want to upgrade my GPU to ASUS ROG STRIX 1070 and want to buy a triple monitor setup. Problem is the max resolution i want to play:(
It will be 2160p in total of all 3 monitors, is possible achieve this value with three monitors?
I tell you because i have 3 possibilities that i will put here.

1) 3 monitors 1080p with a total of 5760x1080 and 2 problems.
I dont' use 1920 because max width want to play with will be 3840 and 1080 is not 2160.
2) 3 monitors 2160p where i have a 2160 in height but even worst with 7680 unused in width.
3) Is possible to mix monitors with different resolutions? Maybe downscale their resolution in order to obtain a 4K in total?

4K because don't want to go beyond, since not tested and telling the truth i will have problems even in 4k. This is my target, hope you will help me:)