https://arstechnica.com/gaming/2021/09/further-testing-shows-new-ps5s-smaller-lighter-heatsink-keeps-console-cooler/

Last month, Sony began shipping a lightly revised version of its PlayStation 5 console with a smaller, lighter heatsink and a handful of other tweaks. An earlier teardown and analysis of the revised PS5 made headlines because it suggested that the new PS5 ran warmer than the old one, based on the temperature of the air being exhausted from the console. This does make some intuitive sense if you assume that a smaller heatsink will automatically be worse at dissipating heat. But more detailed and precise testing from the YouTubers at Hardware Busters International backs up our skepticism of that claim, showing that the PS5's exhaust air is warmer because the new cooling system is doing a better job of removing heat from the console, as cooling systems are meant to do.