EVGA Z390 DARK (131-CS-E399)
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29. 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.
30. PCIe Disable Switches
These are DIP switches to physically disable power to a specific PCIe slot. By
default, all swi
tches 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.
31. ProbeIt Header
The ProbeIt header is a means of live monitoring several different system
voltages in real-time with a multimeter. One terminal needs to connect to a
ground wire and the other to the specific you are trying to monitor. There are
two ProbeIt connectors: the left connector is J3, and the right connector is J5.
From left to right the function for the J3 connector: VCORE/Ground,
VDIMM/Ground, VGT/Ground, VSA/Ground, and VCCIO/Ground.
From left to right the function for the J5 connector: VCCPLL/Ground,
VCCPLL_OC/Ground, VCCST/Ground, PCH/Ground, and DMI/Ground.
32. PC Speaker
This is a small mono low-fidelity speaker permanently attached to the
motherboard used mainly for debugging purposes. A POST beep may indicate
a successful POST, various tones for USB initialization, and other beeps to
indicate an issue during the post process. Please see Page 151 for more details.
33. BIOS SafeBoot Button
Pressing this button while the system is running will reboot the motherboard
directly into the BIOS without clearing CMOS. This feature is very useful for
situations where the motherboard is unable to complete boot due to a failed
overclock and the user does not want to erase the previous settings used.
34. USB to SPI for BIOS Flash
This USB port is designed to connect directly to the motherboard to allow the
motherboard BIOS to be flashed, even if no CPU is installed. For more
information on how to flash your BIOS using this method, please see Page 140.
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