The absolutely minimum thing one can do when posting any kind of news is to link to a source. You can check some other threads to get an idea. When you say “some reviewers say”, at least share those reviews.
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The whole discussion on comparison between DLSS 3, DLSS 4, FSR 3.1 and FSR 4 is already covered by Digital Foundry which was also posted on another thread.
FSR4 uses FP8 Wave Matrix Multiply Accumulate which requires much more processing and hence the new hardware for RDNA4. AMD had kept the door open for RDNA3 in the future but the overhead will be a lot.
An interview with AMD’s Frank Azor reveals the company’s plans for FSR 4. It also tells us a bit more about why the GPUs were absent during CES 2025.
www.digitaltrends.com