IEI Integration ROCKY-3786 v4.0 - Manual (Page 124)

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BIOS Menu 9: Frequency/Voltage Control
Auto Detect DIMM/PCI Clk [Enabled]
Use the Auto Detect DIMM/PCI Clk option to actively reduce EMI (Electromagnetic
Interference) and reduce power consumption by turning off unoccupied or inactive
expansion slots.
Disabled
AGP, PCI and memory slots are not monitored.
Enabled
(Default) AGP, PCI and memory slots are monitored and clock
signals to all unoccupied and inactive slots are turned
off.
Spread Spectrum [Disabled]
Use the Spread Spectrum option to reduce the EMI. Excess EMI is generated when the
system clock generator pulses have extreme values. Spreading the pulse spectrum
modulates changes in the extreme values from spikes to flat curves, thus reducing the
EMI. This benefit may in some cases be outweighed by problems with timing-critical
devices, such as a clock-sensitive SCSI device.