I’ve never used a laptop cooling pad before but I’ve found that maybe 30 minutes into a higher demanding game the game will start to slow down noticeably. I’m assuming that it’s the GPU throttling due to the heat, and I’ve been considering whether a cooling pad for my desk would be warranted. I’ve already installed PTM450 a while back so that’s out of the picture.
Peltier units (the plate in the middle of this cooler) aren’t very good. Having the hot side next to the fans also means the shunted heat can mix with the cooling air they’re sending up towards the laptop. I had decent results with an old Klim unit that blows air past the bottom of the laptop; it more or less shunts the heat away using the chassis itself as a heatsink.
Start with a laptop stand first, this should improve cooling alot. Besides that, several YT videos show, there is not much improvement from a cooling pad over a stand.