American Megatrends Enterprise-III User Manual page 23

Step 2 Set Switch and Jumper Options,
J19 CPU Priority
J19 is a three-pin header that selects the CPU priority. Short pins 1-2 to set Low priority (the default setting). Short pins 2-
3 to set High priority.
J20, J21, J24 Select Processor Speed
Set the following two-pin berg headers as described in the table below for 20 MHz operation.
Chapter 4 AMIBIOS POST
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Continued
Jumper Setting
J20 CLOSED
J21 OPEN
J24 OPEN