EVGA Z270 Classified – K (134-KS-E279)
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21. CMOS Reset Button
This button has two main uses: the first is standard practice to clear BIOS and
power on before updating the BIOS, and the second is standard practice when
troubleshooting instances when the motherboard fails to POST, such as after
upgrading RAM or CPU, installing new hardware, a failed overclock, etc. This
button provides a much faster means of resetting than the previous method of
removing power from the board, removing the CMOS battery, and discharging
power to the board. In rare occasions the older method can help; pressing the
clear CMOS button will normally allow you and your system back into the
default BIOS.
22. Debug LED / CPU Temp
This is a 2-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 in the back of this manual, in the
troubleshooting section on page 148. After the system boots, it will display a
temp in Celsius. This temp is specifically for the CPU socket, which will
typically read a little higher than a given CPU core. To read this temp in
Fahrenheit, take the value in Celsius, multiply by 9/5 (or 1.8) and add 32.
23. USB 3.0 Headers
The USB3.0 headers 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 the
same as the USB3 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 standard is 900ma @ 5V for unpowered devices. If your USB device
requires more power than this, 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.
24. 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 the
same as the USB2 found on the motherboard’s hardwired I/O hub, but these
