Asus P7P55D LE - Manual (Page 52)

2-14 Chapter 2: BIOS information
2.4.13 DRAM Voltage [Auto]
Allows you to set the DRAM voltage. The values range from 1.5V to 2.2V* with a
0.1V interval.
According to Intel CPU spec, DIMMs with voltage requirement over 1.65V may
damage the CPU permanently. We recommend you install the DIMMs with the
voltage requirement below 1.65V.
2.4.14 CPU PLL Voltage [Auto]
Allows you to set the CPU PLL voltage. The values range from 1.8V to 2.1V with a
0.1V interval.
2.4.15 PCH Voltage [Auto]
Allows you to set the Platform Controller Hub voltage. The values range from
1.05V to 1.15V with a 0.10V interval.
The system may need better cooling system to work stably under high voltage
settings.
2.4.16 DRAM DATA REF Voltage on CHA/B [Auto]
Allows you to set the DRAM DATA Reference Voltage on Channel A/B/C. The
values range from 0.395x to 0.630x with a 0.005x interval. Different ratio might
enhance DRAM overclocking ability.
Fixed Voltage [Auto]
This item appears only whne you set the CPU Voltage Mode item to [Manual] and
allows you to set a fixed CPU voltage. The values range from 0.85V to 1.70V* with
a 0.00625V interval.
Refer to the CPU documentation before setting the CPU Vcore voltage. Setting
a high VCore voltage may damage the CPU permanently, and setting a low
VCore voltage may make the system unstable.
2.4.12 IMC Voltage [Auto]
Allows you to set the CPU Integrated Memory Controller voltage. The values range
from 1.1V to 1.45V* with a 0.05V interval.