ASROCK Z87M OC Formula User Manual page 86

PCH 1.05V Voltage
Chipset 1.05V Voltage. Use default settings for best performance.
PCH 1.5V Voltage
I/O 1.5V Voltage. Use default settings for best performance.
PCH IREF 1.5 Voltage
Configure the PCH 1.5V reference voltage.
VCOMP Voltage
Configure the CPU compensation voltage.
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