More RAM will quiet your fans if you're running out.

Yes, assuming your current workload regularly pushes past 8GB and forces swapping. That constant disk activity generates heat, which makes fans spin up. More RAM means less swapping, less heat, quieter operation.

The mechanism is real. When your system runs out of physical RAM, it starts using your SSD or hard drive as virtual memory — called swapping. Disk I/O uses more power and generates more heat than keeping data in RAM. That extra heat means your fans have to work harder. If you’re sitting at 7.5GB used on an 8GB system, adding another 8GB will stop the swap, reduce heat, and likely drop the fan speed.

That said, if you’re only using 6GB of your current 8GB, more RAM won’t help the fans at all. The problem isn’t there. Also, running two sticks instead of one can sometimes increase heat from the RAM itself, but it’s trivial compared to the disk savings.

Check your memory usage first. If it’s consistently near 100%, 16GB will quiet things down. If not, look for other causes — dust in the heatsink, poor airflow, or a dying fan bearing.