I'm sure there's always airflow inside even if very small so copper will definitely be more capable in transferring the heat and I also already have a few here.
The Fan controller is so that I can use thermal sensors too and then can regulate the fan to whetever I want, also from what I see the PS5 original fan prefer to be dead silent than to actually cool the console because I saw a video of TronicsFix where he replaced the liquid metal for normal compound and the console instead of getting noisy and spin up the fan more, it seems it prefer to be quiet and not much it just shuts down....
The Fan controller is so that I can use thermal sensors too and then can regulate the fan to whetever I want, also from what I see the PS5 original fan prefer to be dead silent than to actually cool the console because I saw a video of TronicsFix where he replaced the liquid metal for normal compound and the console instead of getting noisy and spin up the fan more, it seems it prefer to be quiet and not much it just shuts down....