ASROCK X38TURBOTWINS User Manual page 59

NB Core Voltage
Use this to select Northbridge Core Voltage. Configuration options: [Auto],
[Low], [Middle], [High] and [Highest]. The default value of this feature is [Auto].
SB Voltage
Use this to select Southbridge Voltage. Configuration options: [Auto], [Low],
[Middle], [High] and [Highest]. The default value of this feature is [Auto].
VTT Voltage
Use this to select VTT Voltage. Configuration options: [Auto], [Low],
[Middle], [High] and [Highest]. The default value of this feature is [Auto].
GLTREF Voltage
Use this to select GLTREF Voltage. Configuration options: [Auto], [0.67 x Vtt],
[0.65 x Vtt], [0.63 x Vtt] and [0.615 x Vtt]. The default value of this feature is
[Auto].
DRAM RCOMP Setting
Use this to adjust DRAM RCOMP Setting feature. Configuration options: [Auto]
and [Manual]. The default value of this feature is [Auto].
CIR10 Field 1
Use this to enable or disable CIR10 Field 1. The default value of this feature is
[Enabled].
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