EVGA Z790 DARK K|NGP|N (121-RL-E799)
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27. ProbeIt Header JAT1
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 voltage you want to monitor.
From top to bottom, the function for the JAT1 connector: CPU Vcore, CPU
VCCIN AUX, CPU VDD2, CPU 1.05V, CPU 1.8V, PCH 1.05V, PCH 0.82V,
PCH 1.8V, 12V_CPU, GND.
28. PC Speaker
A small mono low-fidelity speaker, 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 114 for more details.
29. 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.
30. 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 105.
31. SW Slow Mode Switch
This switch forces the CPU clock ratio to the lowest possible value (800MHz
for Raptor Lake-S / Alder Lake-S CPU) in real-time. This can be helpful for
benchmarking and performance tuning, especially with extreme overclocking.
Active Slow Mode is indicated by a red LED near the switch. This is a
hardware-based function and not accessible through the BIOS or software.
32. Clear CMOS Button
This button clears any saved settings in your motherboard BIOS and resets all
settings back to default. Clear the CMOS prior to the first power on,
before/after updating the motherboard BIOS, and when troubleshooting after
installing new hardware or unsuccessful attempts to boot into the BIOS or OS.
This button does not delete saved profiles, nor can it reset your BIOS version.
