DLSS is elaborated as " Deep Learning Super Sampling ". It is an AI power upscaling technology developed by NVIDIA. In NVIDIA's marketing DLSS has played crucial role. DLSS technology has improved the gaming performance by upscaling the resolution and FPS (frames per second)of gameplay. This is possible even the game has lesser resolution or FPS. The DLSS technology is exclusive to NVIDIA graphics cards only.
Although testing of RTX 40 series and RTX 50 series have performed very close until using DLSS 3 and DLSS 4 technology comes in use. DLSS 3 is RTX 40 series and DLSS 4 is RTX 50 series exclusive.
DLSS 4 has helped the RTX 50 series to enhance the performance with AI upscaling to another level 🤯. The only major difference between RTX 40 and RTX 50 series is DLSS.
Finally I think the extra $ 400 for rtx 5090 compared to RTX 4090 is for the latest DLSS 4
