Chapter 3, Dram data ref voltage on cha [auto, Dram ctrl ref voltage on chb [auto – Asus P8Z77-V PRO/THUNDERBOLT User Manual
Page 86: Cpu spread spectrum [auto

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Chapter 3: BIOS setup
Chapter 3
DRAM DATA REF Voltage on CHA [Auto]
Allows you to set the DRAM DATA Reference Voltage on Channel A/B. The values
range from 0.395x to 0.630x with a 0.005x interval. Different ratio might enhance DRAM
overclocking ability.
DRAM CTRL REF Voltage on CHB [Auto]
Allows you to set the DRAM Control Reference Voltage on Channel A/B. The values
range from 0.395x to 0.630x with a 0.005x interval. Different ratio might enhance DRAM
overclocking ability.
CPU Spread Spectrum [Auto]
[Auto]
Automatic configuration.
[Disabled]
Enhances the BCLK overclocking ability.
[Enabled]
Sets to [Enabled] for EMI control.
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