Are temp sensors for Ryzen CPUs inaccurate?

I have a Ryzen 3950X cpu. In the Asus Bios, I sent the fans to spin at 100% RPM at a temperature of 70C. However, they definitely don't spin at 100% RPM at 70C. The temperature needs to reach 75C-80C before they reach 100% From looking at Google, this might be because running sensors on Linux is not as accurate as using "Ryzen Master" on Windows. Are they any good Linux substitutes?