What
chaos666 posted.
check your motherboard manual to see if you can select type of fan control, and if you can can, change it from pwm to variable voltage.
you cannot control fans with other software if your motherboard does not have 3-pin variable speed fan control.
if your motherboard does not support 3-pin variable voltage control you will need to use an independent fan controller. tealc (member here) used to make some very nice pwm to variable voltage controllers. link below is to his thread about them. don't know if he's still about, or if he is setup to still be able to make you one, but might be worth sending him a trust message and finding out.
https://www.overclockers.co.uk/forums/threads/pwm-to-analog-converter-circuit.18421145/
another option might be aqua computer splitty9 for £9.95. they say
"splitty9 is a universal ninefold splitter and can be used for 3-pin fans".
https://www.overclockers.co.uk/aqua...p-to-9-fans-or-aquabus-devices-bb-004-aq.html