DLDSR
The DSR portion of DLDSR is meant for when you have room to render the display at higher resolution than the screen can output (in your case more than 4k) and size it down to the screen.
Making it
Render higher than screen -> downsize the oversized render back to output resolution -> display the resized render
The DL portion of DLDSR is meant the help the "downsize the oversized render back to output resolution" process because traditionally that was additional delay and processing, where the DLDSR will simply let the tensor core of the RTX cards handle the process to free up gpu processing power.
What you want is DLSS because DLSS can take 720p or 1080p processed output and stretch to larger (like 1440p or 4k) screen without looking ugly.
DLDSR only benefits if you have powerful enough gpu that you GPU had more room to render more detail/higher resolution than your screen can take.
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