EVGA X299 DARK Owner's Manual page 99

EVGA X299 DARK (151-SX-E299)
load temp for your specific processor, which can be found at Ark.Intel.com. All Smart
Fan Settings have the same controls and can be setup the same way.
When monitoring temperatures vs. fan speed, you may notice a variance in ramp
up/down temps; this is due to a function EVGA hardcodes into the BIOS called
Hysteresis. Hysteresis builds in a buffer to control fan speed behavior. This feature
prevents a constant ramp up/down from happening when your system sits exactly at the
temp you set for SMART fan controls. For example, if your setting is at 30C and you
hit 31C, the fan will ramp up and cool down to 29C, letting the fan slowdown, which
lets the system heat back up to 31C again, repeating indefinitely and causes the system to
sound like it's breathing. Hysteresis adds a 4C +/- buffer for CPU and PWM, and 2C
+/- for SYS. This means that once a fan based on the CPU or PWM temp brings you
down to 30C, it will not ramp back up until 34C, so you have a buffer. If you base the
fan control on the SYS temp, you will only see 2C variance.
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