DSR nvidia

[Abiak]

My monitor = 2560x1440, I wanted to play 4K (3840x2160).
1) How I set up the nvidia panel:
DSR factors = 2.25x
DSR smoothness = 50%
Display > change resolution > 3840x2160
Display > Adjust desktop size and position > 3840x2160 + No scaling + override the scaling mode set by games (I've read scaling gives lag)
In game resolution = 3840x2160
Is everything ok?

2) If games have supersampling anti-aliasing and render scaling options, do you recommend them instead of DSR?
E.g. For Honor

[RealNC]

My monitor = 2560x1440, I wanted to play 4K (3840x2160).
1) How I set up the nvidia panel:
DSR factors = 2.25x
DSR smoothness = 50%
Display > change resolution > 3840x2160
Display > Adjust desktop size and position > 3840x2160 + No scaling + override the scaling mode set by games (I've read scaling gives lag)
In game resolution = 3840x2160
Is everything ok?

Yes.

Note that if you want to test various smoothness settings, you can just change it live without restarting the game, if the game runs in true fullscreen mode. Just alt+tab from the game to the nvidia panel, change smoothness, click "Apply", and then alt+tab back to the game. The new smoothness setting will be used.

2) If games have supersampling anti-aliasing and render scaling options, do you recommend them instead of DSR?
E.g. For Honor

Yes. It's generally better than DSR, because the game can be smart about what parts of the graphics need supersampling. It can also look better. DSR can be blurry, especially when "smoothness" is not set to 0%.