8 core ARM processor for the Switch 2, custom-made by nvidia. I played on the Switch 2 on a 4k monitor, pretty sure upscaling was involved, but it's very smooth.

Pretty sure a Deck 2 would significantly out-perform the Switch 2, but I haven't heard anything about the Deck 2 yet.

Actually, looking at raw specs... the Switch 2 seems to have almost similar specs to the PS4... except it's ARM, and the Switch actually has more GPU compute cores. And since the Steam Deck can't emulate the PS4...