MSI X99S MPOWER Overclocking Guide - Manual (Page 6)

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CPU Ring
Voltage
System Agent
Voltage
CPU I/O
Voltage
DRAM Voltage
Eventual DRAM
Voltage
PCH 1.05
Voltage
Adjust CPU Ring voltage. When overclocking Ring Ratio, it
is necessary to increase the Ring voltage to ensure CPU OC
stability.
Adjust the voltage of the internal memory controller (IMC) in the
CPU. Therefore, adjusting System Agent voltage may improve
memory OC stability.
It is also called the CPU VTT voltage. It is another IMC voltage.
It may also improve OC performance when memory is running at
high frequency in an OC operation.
The I/O Voltage in the BIOS is divided into Analog and Digital.
Adjusting these 2 sets of voltages may help with the overclocking
for some memory modules.
Adjust memory core voltage. When overclocking memory, it is
necessary to increase the DRAM voltage to ensure memory
stability.
This value denotes the actual effective voltage of the DRAM
after the BIOS Code. Unlike the actual effective voltage of the
DRAM after booting up, this feature only needs to be adjusted
depending on the overclocking characteristics of ICs on each
memory module.
When the overclocking of BCLK becomes unstable or failed,
users may try to adjust this voltage to increase the chances of a
successful boot. It is recommended that the maximum voltage
adjustment not go beyond 1.35V, or else the PCH chip may
overheat and become unstable.