I have been gone for about 15 years and rejoined SETI@Home a few days ago.
My new PC is a MSI GE75 Raider Gamer Notebook (by CUK) with Intel I7-9750H (12 threads), 32GB RAM, 512GB NVMe SSD, NVIDIA GeForce RTX 2070 8GB, 17.3" FHD 144Hz 3ms running Windows 10 Home.
Note: I am not a Gamer, just needed a fast, affordable 'office' PC.
Prior to installing SETI@Home, only one fan would run, at ~2400 RPM and it was very quiet.
The default SETI Project settings spun both fans at high RPM and my wife couldn't stand the noise.
I played around with various settings and finally settled on:
. No GPUs used SETI
. 75% of the CPUs (9 threads)
. 33% CPU Time
. 75% Memory usage
. Never Suspend, except on Battery
With these settings and forcing the second fan to run, I am able to keep fan speed below 3000RPM, very quiet.
My wife is happy.

Any suggestions for improving performance, while still keeping temperatures in check?

Jerold Schulman

I have the same experience with a much more modest MSI laptop.
Using the gpu alone (with the necessary cpu thread) both fans spin at or near maximum,. I can't find a way of limiting gpu activity, so I get only cpu wu's.
I limit number of threads to 5 (out of 8) in order to keep temperature and cpu-fan speed tolerable.
It's clear to me that laptops with separate gpu are not dimensioned to exploit theit full potential.

Back at the BIONIC forum, they pointed be to TThrottle at https://efmer.com/
I reset everything to 100% and tthrottle is keeping my temperatures where I configured them.
Try it.