EVGA X299 Micro ATX 2 Installation Manual page 18

EVGA X299 Micro ATX 2 (121-SX-E296)
17. USB 2.0 Headers
The USB 2.0 headers are used to connect additional USB interface plugs to the
motherboard; these headers are most often used to connect the motherboard to
the chassis to enable the USB 2.0 ports on the chassis. These will function the
same as the USB 2.0 ports found on the motherboard's hardwired I/O hub, but
these can be used to attach to front panel USB, auxiliary ports that mount in the
card slots, and also some devices that directly connect to the header.
USB 2.0 standard is 500mA @ 5V per port (header total is 1000mA) for
unpowered devices. If your USB device requires more power than this, it is
recommended to attach a powered USB Hub.
18. Front Panel Audio Connector
This is a motherboard header, which is used to plug in the audio cable
originating from most PC chassis to allow audio to be recorded from or played
through the audio connectors on the chassis. This header has a connector that
looks similar to USB2 and will use the standard "HD Audio" jack. Some
systems may have two headers: one labeled HD Audio, and one labeled AC'97
– this header is not compatible with AC'97.
19. Front Panel Connectors
The Front panel connectors are the four main chassis connections. These
include the Power Switch, Power LED, Reset Switch, and HDD LED. The
Power and Reset switches are both designed to use "Momentary Switches,"
rather than "Latching Switches," which means the connection between the two
posts needs to be made just briefly for it to work, as opposed to being held in
place. This is why the Power and Reset switches can be triggered with a screw
driver by simultaneously touching the + and - posts.
Power LED will power on with the system, indicating the system is on and can
blink with CPU activity.
HDD LED will blink during access to the SATA ports. M.2 SSDs will also
activate this LED.
20. CMOS Battery
The +3V CMOS battery backup provides uninterruptable power to the
BIOS/UEFI to keep all of the settings; otherwise, each boot would behave like
you just reset the BIOS. These batteries typically last several years and rarely
need to be replaced.
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