What graphical settings did you lower to achieve that? According to Digital Foundry dropping all settings to high and shadows to medium and substantially overclocking the card still did not allow them to achieve locked 60fps on 970 at 1080p, so I am curious how did you achieve that.
http://www.eurogamer.net/articles/digitalfoundry-2016-the-division-pc-tech-analysis said:
1080p60 on ultra is off the table for both cards - we got closer by dropping down to high settings with medium shadow resolution. This improved in-game fluidity no end, but it required a meaty +200MHz core overclock along with +400MHz to the memory in order to get the GTX 970 to more consistently hit the target.
I achieved locked 60fps at 1080p on overclocked 980Ti after the following "downgrades":
Shadow Quality: High (notch down from PCSS+)
Particle detail: High (notch down from Ultra)
Volumetric fog: High (notch down from Ultra)
Object detail: 80% (max is 100%)
Extra streaming distance: 80% (max is 100%)
This might have been a tad too aggressive, it's possible that leaving the last two options at 100% would make no difference. But definitely the single biggest performance sapper are PCSS+ shadows. Luckily I don't like their realistic blurred look, so I gladly disabled them.