In what games? A 980 can play just about anything well at 4k or 1800P, and ram usage barely goes over 2GB. Digital Foundry even has an on going series using the 970 and testing games like Crysis series, Batman series, Forza series and it does fine.
Try maxing out the settings on titanfall 1 and 2 at 1440 res.
Shadow of Mordor as well and I believe DOOM.