EVGA NFORCE 680I SLI 122-CK-NF68-XX - Manual (Page 18)

Introduction
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Figure 19. Adjust Motherboard Settings (nTune)
CAUTION: Increasing the voltage or the clock speed of a component may
void its warranty due to exceeding recommended specifications. NVIDIA
and the board manufacturer are not responsible for damage that may occur
when component tolerances are exceeded.
System Clocks
This section of the Adjust Motherboard Settings allows you to adjust the
reference clocks for the FSB, the SPP PCI Express, and the MCP PCI Express.
Note that as you change the slider for the FSB reference clock, the CPU core
frequency, the FSB Frequency and the memory bus frequency are dynamically
changed.
System Voltages
CAUTION: Overvoltaging any component can result in damage.