IEI Integration NOVA-HM551 v1.10 - Manual (Page 113)

NOVA-HM551 5.25" SBC
Page 99
Î Azalia HD Audio [Enabled]
Use the Azalia HD Audio option to enable or disable the High Definition Audio controller.
Î
Disabled The onboard High Definition Audio controller is disabled
Î
Enabled D EFAULT The onboard High Definition Audio controller
automatically detected and enabled
Î Set Spread Spectrum [Disabled]
Use the Set 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.
Î
Disabled D EFAULT EMI not reduced
Î
Enabled EMI reduced