BIOSTAR Z270 Fan Control
From BIOSTAR's manual we can see that their fan headers provide +12v to the power pin and SMART fan control on the fourth, so they are using PWM-only headers. PWM-only headers won't be able to control 3-pin fans; they will instead run full speed. So if you go with BIOSTAR, you should use PWM fans.
BIOSTAR Z270 UEFI Offering
BIOSTAR's fan settings are not your typical settings, more like parts of a fan control equation. You have control modes; quiet, aggressive, and manual. Manual unlocks Fan Ctrl OFF (temperature where the fan turns off), Fan Ctrl ON (temperature where the fan turns on), Fan Ctrl Start Value (PWM duty cycle percentage when the fan turns on), and Fan Ctrl Sensitive ("the numeral is bigger the Fan speed is higher"). You can also calibrate each fan individually, and these will spit out recommended Fan Ctrl values for you to start with.
BIOSTAR Z270 Software Offering
BIOSTAR's fan control offerings are under the H/W Monitor menu in their Racing GT application. You don't have many options; I think BIOSTAR was going for simple. You can calibrate the fan and then leave it on Auto mode to apply the calibrated values. You can see that the values did change after I calibrated the fan.
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