Right. I can't see Nintendo going for a 4nm process though atleast for first revision. If it's 8nm I wonder where it leaves their power budget based on current switch constraintsSwitch 2's SOC could be on the 4N process and will use ARM CPU's, so its likely that it will be more power efficient than the Ryzen powered APU in Deck. With that said, Deck is allowed to run full tilt in portable mode and Switch 2 wouldn't be doing that due to thermal limitations and battery life. Deck has a max TDP of 15w while Switch 2 will likely be around 5w for the SOC in portable mode. I do not see them getting beyond 1Tflop of performance in portable mode. Considering Switch is maxed out at 235Gflop in portable mode and assuming the screen remains at 720p, this will still be a big upgrade over Switch. Proper DLSS support will be the silver bullet for Switch 2. The results are pretty good at taking 720p to 4k and even better for 1080p to 4K. Perhaps Nintendo allows the DLSS profile to be changed depending on the display output resolution. For example, if your Switch 2 is hooked up to a 1080P display and the game renders at 702p internally, it will use DLSS quality mode instead of performance mode because it is only scaling to 1080p, or perhaps to 1440p and them downsample to 1080p.
I had a friend of mine run some games on his Deck while setting the TDP down to 5 watts and played Doom 2016. He was able to render at 580p with medium settings at a solid 30fps. The Deck starts to really come alive when its APU is set at 10 watts and up, but this a power draw that wont be supported for Switch 2 in portable mode. It just goes to show that its not easy delivering PS4 quality visuals on 5 watts of power.