Acer Veriton M490G Service Manual page 30

Frequency/Voltage Control
Parameter
Enabled Clock to All DIMM/
PCI/PCIE
Spread Spectrum
Chapter 2
Description
If enabled, whatever the slot has been inserted or not, clock will be
sent. Disable clock toempty DIMM/PCI/PCIE slots if option is disabled.
Enables or disables the reduction of the mainboard's EMI.
Note: Remember to disable the Spread Spectrum feature if you are
overclocking. A slight jitter can introduce a temporary boost in clock
speed causing the overclocked processor to lock up.
Option
Disabled
Enabled
Enabled
Disabled
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