EVGA Z490 DARK (131-CL-E499)
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30. ProbeIt Header J3
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 left to right the function for the J3 connector: VCORE/Ground,
VDIMM/Ground, VGT/Ground, VSA/Ground, and VCCIO/Ground.
31. ProbeIt Header J5
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 left to right the function for the J5 connector: VCCPLL/Ground,
VCCPLL_OC/VCCSTG, VCCST/VCCIO12, 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 155 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 147.
35. SW Slow Mode Switch
This switch forces the CPU clock ratio to the lowest possible value (8.0 for
Comet 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
does not need any BIOS settings or software to operate.