The 900 series GPU's are pushed more towards 1440p and 4K gaming than 1080p gaming, if you look at SLI benchmarks of both cards, you see increased performance scaling at higher resolutions than 1080p by almost double in most cases. If I'm not mistaken 1440p has 2ms response rate now which it didn't have when it came out, so yes 1440p would definitely be worth it.