XFX 650I - Manual (Page 54)

Installing and Configuring the XFX nForce 650i Ultra Motherboard
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Frequency Settings
CPU Freq, MHz
This value is set by the CPU Multiplier (value cannot be changed by the user).
FSB Reference Clock. MHz
This value is set by the system (value cannot be changed by the user). To
change the FSB memory, and memory timing, go to the FSB & Memory
screen.
CPU Multiplier
This value changes the CPU Frequency value depending on the value you
choose. Use the
Page Up and Page Down keys to scroll through the options.
The options are from 6 X through 60 X.
PCIe x 16_1, MHz
Use the Page Up and Page Down keys to scroll through the frequency
options for the PCI Express Bus, Slot 1 (the black slot closest to the CPU).
Note that as you go higher in value,
PCIe Spread Spectrum(SPP) is
disabled and cannot be changed from this status.
SPP< — >MCP Ref Clock, MHz
Use the Page Up and Page Down keys to scroll through the frequency
options for the reference clock between the SPP chip and the MCP chip.