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EVGA Z370 Classified K (134-KS-E379)
AC'97 – an AC'97 cable is not compatible with this header on the Z370
Classified K.
23. PC Speaker
This is a small mono low-fidelity speaker, which is permanently attached to the
motherboard. Its primary use is for debugging purposes. A POST beep may
indicate a successful POST or various tones for USB initialization, while other
beeps may indicate an issue during the POST process. Please see Page 129 for
more details.
24. BIOS Select Switch
This switch toggles between physical BIOS chips. The Z370 Classified K
features two BIOS chips soldered to the PCB. Each chip holds only the
settings and profiles that have been saved to the BIOS chip while active. This
allows you to swap between two physically different BIOS chips. This also
makes it substantially easier to hotflash a BIOS if needed. If instructions are
needed for hotflashing a BIOS, please contact EVGA Customer Service (Page
128 for contact info).
25. 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 "Momentary Switches," rather than "Latching
Switches," which means the connection between two posts only needs a brief
moment to turn on the device, as opposed to requiring a constant connection.
For example, the Power and Reset switches can be triggered instantly with a
screwdriver by simultaneously touching the + and - posts.
The Power LED will power on with the system, indicating the system is on and
can blink in conjunction with CPU activity.
HDD LED will blink during access to the SATA ports; this is not activated for
M.2 SSDs.
26. CMOS Battery
The CMOS battery backup provides uninterruptable power to the BIOS/UEFI
to store all its settings; otherwise, each power on would act as if the BIOS was
just reset. These batteries typically last several years and rarely need to be
replaced.
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