GIGABYTE AMD Socket AM2 Processor Motherboard GA-M59SLI-S5 - Manual (Page 55)

BIOS Setup - 55 -
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N-Chipset/PCIE Voltage
Set the voltage settings for Northbridge, its PCI Express bus voltage.
Normal Set Northbridge/PCIE voltage to Normal. (Default value)
+0.1V Set Northbridge/PCIE voltage to +0.1V.
+0.2V Set Northbridge/PCIE voltage to +0.2V.
+0.3V Set Northbridge/PCIE voltage to +0.3V.
CPU Voltage Control
Supports adjustable CPU Vcore from 0.800V to 1.550V. (Default value: Normal)
Normal CPU Vcore
Display your CPU Vcore voltage.