Resolution scaling explained: (new games nowadays usually have this option in the settings menu)
For example you have a FullHD monitor - 1080x1920 pixels.
If resolution scaling is 100%, your graphics card will render graphics at exactly 1080x1920 pixels
If you set resolution scaling at 90%, your graphics card will render images at 1080 * 0.9 x 1920 * 0.9 pixels which is 972x1728 pixels.
If resolution scaling is lower than 100%, your GPU renders smaller images and upscales them up to your resolution. You may not see a huge difference if you lower it by 5 or 10%, but if you set resolution scaling at, for example, 70%, you will see huge boost in performance, but a step back in graphics quality since your GPU will render 756x1344 pixels instead of native 1080x1920 pixels.
Pros: your GPU will have less work, use less resources and achieve higher framerates
Cons: Lowering res scaling by a large amount will greatly decrease image quality
Personally, i have GTX 760 + i5-4690K and i completed Doom: 2016 using high textures and particles, medium effects, other settings med/high and 75% resolution scale at 1080p, which left me with 60fps almost everytime, except huge fights in big open spaces it dropped to 30. If i dropped Res scaling to 60%, butter-smooth 60fps all-the-time, but i didnt't like the graphics. I Found 75% is my sweet spot at 1080p. Since GTX 950 and GTX 760 have similar performance, you could try using similar settings to mine. But firstly check how it goes on your native resolution and 100% res scaling since you said its lower than 1080p