XFX 650I - Manual (Page 82)

Installing and Configuring the XFX nForce 650i Ultra Motherboard
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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.