With the upcoming FSR4, AMD is working on improving battery life of handheld devices.
Jarred Walton for Tom's Hardware:
Jack Huynh: On the handheld side, my number one priority is battery life. If you look at the ASUS ROG Ally or the Lenovo Legion Go, it’s just that the battery life is not there. I need multiple hours. I need to play a Wukong for three hours, not 60 minutes. This is where frame generation and interpolation [come in], so this is the FSR4 that we're adding.
According to Huynh, FSR4 has been in development for nearly a year and will switch from analytical to AI-based generation. In theory, this should help improve battery life on handheld devices.
AMD should be commended for creating multiple agnostic upscaling tech. Each version of FSR could be seen almost as tiers of choice. Arguably, all of them were never good enough until FSR3.1 which allows using *other* upscalers. Now with FSR4, the hope is that AMD has built up enough experience of Do's and Don't's to leverage ML and ML hw accelerated silicon.
Hopefully AMD finds a middle ground, where properly tuning FSR4 is not so reliant upon developer tagging, like FSR2 and FSR3 require to get proper good results. Considering that we've already heard good results from PSSR on PlayStation, the expectations are optimistic, at least from me.
Will FSR4 have the ability to leverage *all* ML accelerated hardware? Will AMD attempt to be agnostic with FSR4? I hope so.
But what is unclear is when this new version of FidelityFX Super Resolution (that's what FSR stands for) will come to market, and if it will support existing chips or if we need to wait for the Z2 Extreme and equivalent chips.
Also, games won't magically improve as soon as AMD releases FSR4. Game developers (or the modding community) first need to add support for FSR4 to their games.