User Guide
Page 18
... by EMI, set to [Enabled], the system will become less stable. Remember to disable Spread Spectrum if you to a higher frequency. Spread Spectrum When the motherboard's clock generator pulses, the extreme values (spikes) of the pulses are plagued by adjusting the PCI Express clock to adjust the Memory/PCI Express voltage.
... by EMI, set to [Enabled], the system will become less stable. Remember to disable Spread Spectrum if you to a higher frequency. Spread Spectrum When the motherboard's clock generator pulses, the extreme values (spikes) of the pulses are plagued by adjusting the PCI Express clock to adjust the Memory/PCI Express voltage.