Gigabyte GA-P55-UD6 Manual - Page 23
Onboard LEDs and Buttons, ACPI LEDs, CPU VTT/Memory Phase Indicator LEDs - bios
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1-9 Onboard LEDs and Buttons CPU VTT/Memory Phase Indicator LEDs This motherboard contains 4 phase indicator LEDs controlled by the system BIOS to indicate the phase status of the CPU VTT and memory. The green LEDs light up under normal working conditions; the yellow LEDs will be illuminated when an excessive overvoltage or overloading occurs. CPU VTT: GD1: Normal working conditions (green LED) GD2: Excessive overvoltage or overloading (yellow LED) Memory: MD1: Normal working conditions (green LED) MD2: Excessive overvoltage or overloading (yellow LED) ACPI LEDs The 4 embedded ACPI LEDs indicate the system power status (S0, S1, S3, S4, S5) to prevent potential hardware damage due to improper plug/unplug actions. ACPI LEDs: S0_LED S1_LED S3_LED S4_S5_LED - 23 - Hardware Installation
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