Intel LH500 User Manual

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2.4.5  PCI-X Slot 5 Jumper: 
 
Header CN9 controls PCI-X Slot 5 setting.  When CN9 is open, no jumper, slot 5 is set to 133MHz. When 
CN9 is on, slot 5 is set to 100MHz.  The frequencies describe here are maximum operating frequencies.  If 
PCI-X channel is shared with other devices, then maximum operating frequency cannot be achieved.
  
   
Refer to the following diagram for the location of CN9.