Comment by Telaneo
On the one hand, PTM7950 is really good. On the other hand, a 50 degree temperature drop can't really be explained by anything other than something being terribly wrong to begin with. That thing might unfortunately be Dell, but I'd imagine if more than three brain cells were involved in temperature management design of that machine, it wouldn't have been quite as catastrophic.
The XPS I have very aggressively keeps the fans off. They don't kick on at all until 80° or so. Of course there's no way to change it other than a userspace daemon.