Should be OK. I run a Surround setup on 3 Asus 27" monitors and must say it great.
I run it on a:
Asus Z77 Sabertooth
16gig G. Skill DDR3 1600
2x Gigabyte GTX 670's
And even on the somewhat older GTX 670's I have not had any problems running any game that supports Eyefinity/Surround at 5760x1080 at ultra/max settings. So you should not have any problems at all on 2x GTX 770's. And you are running the same motherboard.