Comparison of Battlefield 1 resolution adjustments with real display quality
Comparison of Battlefield 1 resolution adjustments with real display quality
It seems the approach you're considering varies in effectiveness. Custom resolutions with tailored settings tend to look better than DSR. Creating non-standard downsampled resolutions using custom settings is simpler than DSR (such as 3840x1080). The maximum resolution you can achieve at 60Hz is 3840x2160; beyond that, reducing the refresh rate becomes necessary. With DSR, you don’t have to compromise your refresh rate for downscaling, and the highest DSR factor known is 64x, which can be adjusted via registry changes.
I found this somewhere. DSR is basically simplified version of custom resolutions with a different filter (not bilinear but gaussian) and not being limited by hz,screen or cable. So there is filter difference. Need to search more which filter is more better or both have different aspects.