TAG 20 - Manual (Page 90)

5-6 Setup Configuration Utility (SCU)
Advanced Menu
The Advanced menu contains the Input/Output (I/O) configuration
settings of the system.
Geyserville Support
This item is only available if the CPU you are using supports the Intel®
SpeedStep™ function. It allows maximum CPU performance when using
AC/car power but minimum CPU performance when using battery
power. The available options are Enabled and Disabled.