Because I didn’t even know that was an option until I read this thread. I would need to check what my BIOS supports. This is a recent Gigabyte motherboard and latest BIOS, so I imagine you can do it. Thanks for the tip.

The Corsair software allows you to create a custom curve for fan speeds by CPU temperature, which I use. It also has a lot of temperature and speed monitors which are sometimes useful, and RGB effects, which I never use. I believe there are others ways to achieve the fine grained control of fan speeds in Linux (or maybe the BIOS), but it is something I would need to get to grips with before considering moving to Linux.

I would like to try Linux Mint, but there are no Corsair drivers for my CPU AIO cooler. There are workarounds, but it is not ideal. It is a choice between how much Windows annoys me compared to the lack of hardware support in Linux. Currently Windows is still winning. Maybe when Windows 10 is out of support I will switch.