Asus H87I-PLUS - Manual (Page 51)

2-24 Chapter 2: Getting started
2.6 Advanced menu
The Advanced menu items allow you to change the settings for the CPU and other system
devices.
Be cautious when changing the settings of the Advanced menu items. Incorrect field values
can cause the system to malfunction.
2.5.27 DRAM DATA REF Voltage on CHB [Auto]
Allows you to set the DRAM DATA Reference Voltage on Channel B. The values range from
0.3950x to 0.6300x with a 0.0050x interval. Different ratio might enhance DRAM overclocking
ability.
2.5.28 CPU Spread Spectrum [Auto]
[Auto] Automatic configuration.
[Disabled] Enhances the BCLK overclocking ability.
[Enabled] Sets to [Enabled] for EMI control.