MSI X99S GAMING 9 AC - Manual (Page 65)

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▶Internal VR OVP OCP Protection [Auto]
Enables or disables the over-voltage protection and over-current protection for
CPU internal VR (Voltage Regulator).
[Auto] This setting will be configured automatically by BIOS.
[Enabled] Enables the limitation of internal VR for over-voltage protection and
over-current protection.
[Disabled] Disables this function for overclocking.
▶Internal VR Efficiency Management [Auto]
Enables or disables the CPU internal VR efficiency management.
[Auto] This setting will be configured automatically by BIOS.
[Enabled] Enables the VR effciency management for power-saving control.
[Disabled] Disables this function.
▶DMI Gen 2 [Enabled]
Enables or disables DMI (Direct Media Interface) generation 2.
▶DMI De-emphasis Control [-6dB]
Sets the de-emphasis value to improve DMI margins. However, the default usually
works best.