Asus Z170-AR, Manual

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Chapter 1: Product Introduction
3. Power-on button
The motherboard comes with a power-on button that allows you to power up or wake
up the system. The button also lights up when the system is plugged to a power source
indicating that you should shut down the system and unplug the power cable before
removing or installing any motherboard component.
4. EZ XMP switch
Enable this switch to overclock the installed DIMMs, allowing you to enhance the
DIMM’s speed and performance.
The EZ XMP LED (XLED1) lights up when you enable the EZ XMP switch. For the location
of the EZ XMP LED, refer to section 1.8 Onboard LEDs .