Foxconn A9DA Series User Manual page 36

"Memory Speed Adjust".
► Current DRAM Speed
This item displays the current DRAM speed.
► GFX Engine Clock Override
This item allows you to enable/disable GFX Engine Clock Override support.
► PCI Express Clock
This option is used to adjust the speed of PCI Express slot. It may enhance the graphics card
speed.
► Spread Spectrum
If you enabled this function, it can significantly reduce the EMI (Electromagnetic Interference)
generated by the system, so to comply with FCC regulation. But if overclocking is activated,
you had better disable it.
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