Asus Z170-AR Manual page 47

3. EZ XMP LED (XLED1)
This LED lights up when you enable the EZ XMP switch.
4. LED Design
These LEDs light up when the system is fully powered and operating. To turn off the
LEDs, refer to BIOS section 2.6.8 Onboard Devices Configuration > LED Design
Switch for details.
ASUS Z170-AR Series 1-35