Ok, it turns out that Skyrim SE is capped at 60 FPS. And, the GTX 1650 laughs at all graphics settings below "ultra" -- at anything less, it hits 60 FPS without the GPU utilization even getting close to 100% (this is at 1080p resolution). At "ultra" settings, it will hover around 57-59 FPS most of the time (60 FPS when you are talking to NPCs); at worst, it will go down to about 50 FPS during battle scenes.
I'm kinda surprised; I didn't think this card was quite this powerful.
Ultra is actually quite playable. I still haven't been able to get the card to run the fans at 100%, either; even with GPU utilization maxed out, I guess the card just didn't get warm enough. I'll probably have to wait until summertime again to find out how loud that is. The fans do produce an audible whine running at 80%, but it isn't so bad to me to reposition the case below my desk just yet...
EDIT: At 79% fan speed, I'm reading 43-44 decibels at my seat. The computer sits on the desk in front of me, below my monitor (maybe two feet away).