I’ve got a new 250GB expansion card in my new 12 inch framework and it’s warm even when not mounted. It’s definitely not dangerously warm and it works but, it’s a bit unconfortable when used on the lap and I don’t think it should be generating heat when it’s not being used. If it’s constantly wasting my battery then I probably wont want to leave it in there when I’m not using it, at which point I’m not really sure why I should have it as an expansion card rather than a dongle (apart from the reduced risk of breakage).
NixOS 25.11
Laptop 12
250GB expansion Gen 2