24% on average.
https://www.techpowerup.com/reviews/MSI/GTX_980_Ti_Lightning/23.html
Other:
TWEAKING can make a much bigger difference. For example:
1) Drop to 1080p if the higher framer rate is better than the visual improvements (not all games look significantly better above 1080p).
2) Some settings are extremely demanding with minimal visual benefits
3) *If you want VSYNC to avoid screen tearing then I suggest learning how to apply "Half Adaptive VSYNC" from the NVidia Control Panel. For example:
a) VSYNC OFF
b) Tweak so game is above 72FPS most of the time (90%?)
c) NCP-> Manage 3D settings-> add game-> VSYNC, Half Adaptive.. SAVE
d) Confirm you get SCREEN TEAR (not stutter) if dropping below 72FPS
e) change settings if screen tearing too annoying
Other:
I only get 2/3rds the performance of a GTX980 (GTX680) in Battlefield 3 yet my settings are almost maxed at 1080p. I'm getting a mostly solid 60FPS experience. I use Adaptive VSYNC so occasionally I see a small amount of screen tearing (which would be constant with VSYNC OFF anyway).
To me, spending more money for THIS game would be a huge waste.
GSYNC??
If you don't have GSYNC then I'd eventually upgrade to that.
*If you DO have GSYNC then ignore my Adaptive VSYNC info. Simply put your game to ULTRA settings then if needed drop the resolution or a few other settings if you'd like higher frame rates. I consider 50FPS average the minimum for most games but that is pretty smooth with GSYNC.
**Either way, I would wait and upgrade to an NVidia Pascal with specs similar to THIS:
a) 8GB VRAM
b) 1.25X or greater than GTX980Ti performance (in DX11 games, possibly better still in DX12)