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EVGA Z370 Classified K (134-KS-E379)
19. Debug LED / CPU Temp
This is a two-digit POST code reader, displaying in hexadecimal, which means
the characters available (when working as intended) are 0-9, A-F and has a cap
of 255 characters. The POST codes are listed in the troubleshooting section on
Page 131. After the system boots, it will display the temperature in Celsius.
This temperature is specifically for the CPU socket, which usually reads slightly
higher than a given CPU core. To read this temperature in Fahrenheit, take the
value in Celsius, multiply by 9/5 (or 1.8) and add 32.
20. USB 3.0 Header
The USB3.0 header is 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 USB3.0 ports on the chassis. These will function
similarly to the USB3.0 ports found on the motherboard's rear I/O hub, but
can also be used for the chassis' front panel USB, auxiliary ports that mount in
the card slots, and certain devices that directly connect to the header.
USB 3.0 standard is 900ma @ 5V for unpowered devices. If your USB device
requires more power, it is recommended to attach a powered USB Hub.
USB 3.1 Type-A (found on the I/O Hub) shares the power limit of USB 3.0 at
900ma @ 5V. Whereas USB 3.1 Type-C (also found on the IO Hub) has a
power limit of 3000ma (3A) @ 5V.
21. USB 2.0 Headers
The USB2.0 header is 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 USB2.0 ports on the chassis. These will function
similarly to the USB2.0 ports found on the motherboard's hardwired I/O hub,
but these can also be used for the chassis' front panel USB, auxiliary ports that
mount in the card slots, and certain 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, it is
recommended to attach a powered USB Hub.
22. Front Panel Audio Connector
This motherboard header is used to plug in the audio cable included with most
PC chassis. This connector is required for audio recording and/or playback via
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 provide two headers: one labeled HD Audio, and one labeled
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