Some Motherboard Monitor 5 adds ons are dedicated to control fan RPM . I have not tested them ( my fans doesn't support speed control ) , they have NOT been made by Motherboard Monitor author .
Of course Motherboard Monitor can report fan speed ( and report many things , for example it can detect and report all temperature sensors in your computer like CPU and Motherboard sensors but also hard drives sensors ) .
Adds on are listed on Motherboard Monitor home page .
It seems that only one add on is available ( it is a Software ). Others seems to be hardware projects .
It is called FanSpeed