Asus SABERTOOTH X79 User Manual page 75

DRAM-AB/DRAM-CD Current Capability [100%]
Setting a higher value brings a wider total power range and extends the overclocking
frequency range simultaneously.
Configuration options: [100%] [110%] [120%] [130%]
DRAM-AB/DRAM-CD Voltage Frequency [Auto]
This item allows you to adjust the DRAM switching frequency. Assign a fixed high
DRAM frequency to increase O.C range or a lower DRAM frequency for better system
stability. Configuration options: [Auto] [manual]
DRAM-AB/DRAM-CD Fixed Frequency Mode [XXX]
This item appears only when you set the DRAM-AB/DRAM-CD Voltage Frequency
item to [manual] and allows you to set a DRAM fixed frequency. The values range from
300kHz to 500kHz with a 50kHz interval.
DRAM-AB/DRAM-CD Power Phase control [Auto]
[Optimized] Allows you to set ASUS optimized phase tuning profile.
[Extreme] Allows you to set the Full phase mode.
[Auto] Automatic configuration.
CPU Performance Settings
ASUS SABERTOOTH X79 3-13