Advantech IPPC-9151 Series Benutzerhandbuch

Run the Frequency/Voltage Control as follows:
1.

Choose“Frequency/Voltage Control”from the Main Menu and a list 
of options will appear.

2.

Use one of the arrow keys to move between options and modify the 
selected options by using PgUp / PgDn / + / - keys.

Auto Detect DIMM/PCI CLK
To reduce the occurrence of electromagnetic interference (EMI), the 
BIOS detects the presence or absence of components in DIMM and PCI 
slots and turns off system clock generator pulses against empty slots.
Spread Spectrum
When the system clock generator pulses, the extreme values of the pulse 
generate excess EMI. Enabling pulse spectrum spread modulation 
changes the extreme values from spikes to flat curves, thus reducing EMI. 
This benefit may in some cases be outweighed by problems with timing-
critical devices, such as a clock-sensitive SCSI device.

When you press <Enter> on this item, you will get a confirmation dialog 
box with a message similar to:

“Y” is for “Yes”, and “N” is for “No”.
Pressing “Y” loads the BIOS default values that are factor settings for 
optimal performance of system operations.

A u to  D e c t  D IM M /P C I C lk  

E n a b le d  

Ite m  H e lp

S p r e a d   S p e c tr u m  
 
 
 
 
 
 

E n a b le d   M e n u  

L e v e l