Asus P4C800 Deluxe - Manual (Page 82)

4-16 Chapter 4: BIOS Setup
DDR Reference Voltage [Auto]
Allows selection of the DDR SDRAM operating voltage. Configuration
options: [2.85V] [2.75V] [2.65V] [2.55V] [Auto]
AGP VDDQ voltage [1.50V]
Allows selection of the AGP operating voltage. Configuration options:
[1.80V] [1.70V] [1.60V] [1.50V]
Performance Mode [Auto]
Allows enhanced system performance. Configuration options: [Auto]
[Standard] [Turbo]
Refer to the CPU documentation before setting the CPU VCore
voltage. A very high Vcore voltage may severely damage the CPU!
CPU VCore Voltage [Auto]
Allows you to select a specific CPU VCore voltage. Configuration options:
[Auto] [1.6000V] ... [1.4750V]
Setting to Turbo may cause the system to become unstable! If this
happens, revert to the default setting Auto.