EVGA Z370 MICRO User Manual page 86

EVGA Z370 MICRO (121-KS-E375)
Once into the H/W Monitor section, you can see the temperature monitors across the
top. Below the monitors are the three (3) Smart Fans: CPU1_FAN, CPU2_FAN, and
CHA_FAN. These fans are set to "Smart," which means the controller is using a Smart
curve for fan controls. Each fan can be set to a separate fan curve. To set a Smart
curve, please see the guide starting at the top of the next page.
The +/- buttons next to Smart allow you to set your fans at a static speed percentage,
instead of a curve. If you set the speed too low, however, the fan may stall; the stall
speed will vary from fan to fan.
The fan headers without Smart Fan control can be set to MAX or a percentage of max
speed. The method of control will be auto-detected by the connected fan. If connected
to the motherboard, PWM fans will be controlled via PWM signal (the motherboard
sends continuous pulses to the fan to control its speed), regardless of whether the fan is
powered by the motherboard or a molex power connector. DC fans are controlled by
reducing the voltage the fan receives; as you lower the percentage of fan speed, the fan
receives a proportional drop in voltage.
Both PWM and DC fans are vulnerable to stall points, which may occur if the fan speed
is set too low. PWM-controlled fans are less susceptible to stalls, due to the constant
pulses from the fan controller, but are not immune from stalls. If you notice the fan
behaving erratically (starting/stopping constantly or inconsistent RPM readings), you
may have lowered the fan speed too low. Raising the fan speed higher should resolve
this issue.
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