EVGA Z490 DARK (131-CL-E499)
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25. 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 the USB2.0 header and uses the standard “HD Audio” jack.
Some chassis may have two cables: HD Audio, and one labeled AC’97 – an
AC’97 cable is not compatible with this header on the Z490 DARK.
26. 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; this is not activated for
M.2 SSDs.
27. BIOS Selector Switch
This switch toggles between physical BIOS chips. This board has 3 BIOS chips
as a permanent fixture. Each chip holds only the settings and profiles that have
been saved to the BIOS chip while active. This allows you to swap between
three physically different BIOS chips. Similarly, you can update each BIOS via
the USB Update Port, even if you cannot POST into BIOS. If instructions are
needed for updating the BIOS via the Update Port, please go to Page 147.
28. 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.
29. PCIe Disable Switches
These are DIP switches to physically disable power to a specific PCIe slot. By
default, all switches are in the “On” position to the left. Move the switch to the
right to disable a specific slot. From top to bottom, the switches correspond to
PE1, PE2, and PE4. PE3 is always on. Switches 4 and 5 are disabled.
