Using these settings will have very minimal impact on your graphics, give you a great deal of extra FPS and it will use much less power and usage on your GPU/CPU. You can also turn down things like shadows(low to medium), grass quality(medium), hairworks(OFF) and ambient occlusion(always put on low).
You can turn down AA in 1440p in the majority of games because with such a high resolution, AA is not necessary.
