I picked up boxing again a little while ago, during my hiatus from boxing I picked up two 1440p monitors and now my two old GTX 670 4GB are having a hard time delivering a good enough performance for my taste. Framerates varies from 30 ish to 60 at "good" settings on all 5 accounts wich I guess is reasonable but the upgrade itch is starting.

Form what I have observerd the GPU is a bottle neck at my current settings so I almost clicked "buy" on 2 GTX 980's but decided to do some more testing. Cranked every account up on highest settings with new models and observer VRAM usage go up to 99,2%. So now I an not sure if its worth it to upgrade to another 4GB card.

Does anyone more tech savvy have any deeper insights into what to aim for?