https://bugs.freedesktop.org/show_bug.cgi?id=105718
--- Comment #5 from Shmerl shtetldik@gmail.com --- Actually, I've noticed another similar issue. I just got Sapphire Pulse RX 5700 XT. It's also dual fan.
According to this: https://www.gamersnexus.net/hwreviews/3498-sapphire-rx-5700-xt-pulse-review
The top level of fan rotation (at high load and more performance BIOS setting) is around 1570 rpm. While sensors report that max is 3200 rpm for me!
And something like 50% load (of the fan) is shown as around 1600 RPM!
So I'd say something is definitely off. It's almost like values from both fans are added up, instead of showing actual one.