Thanks for joining the processor community.
I understand the stock processor fan is always spinning at idle rpm and you would like to control speed of the fan.
I see the stock processor fan is working as it should; it keeps the processor cool enough to work under specifications.
If you would like to increase fan rpm's, it as to be through motherboard BIOS, there should be have some settings to control the fan speed, however, this type of settings are available only if your motherboard BIOS provides such options.
Please bear in mind the stock processor fan comes with 3 or 4 wire fan connectors that allow the board to control fan speed.
See here for more information: