IEI Integration PPC-5xxx-9455 v1.10 - Manual (Page 138)

PPC-5xxx-9455 Panel PC
Page 120
5.7.2 Southbridge Configuration
The Southbridge Configuration menu (BIOS Menu 24) allows the Southbridge chipset to
be configured.
BIOS Menu 24:Southbridge Chipset Configuration
Î Spectrum [Disabled]
Use the 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.
Î Disabled D
EFAULT EMI not reduced
Î Enabled EMI reduced