Technical Reference 
55 
2.5.2  Fan Header Current Capability 
  CAUTION 
The processor fan must be connected to the processor fan header, not to a chassis fan 
header.  Connecting the processor fan to a chassis fan header may result in onboard 
component damage that will halt fan operation. 
Table 27 lists the current capability of the fan headers. 
 
Table 27.  Fan Header Current Capability 
Fan Header  Maximum Available Current 
Processor fan  2.0 A 
Rear chassis fan  1.5 A 
 
2.5.3  Add-in Board Considerations 
The board is designed to provide 2 A (average) of current for each add-in board from 
the +5 V rail.  The total +5 V current draw for add-in boards for a fully loaded board 
(all expansion slots filled) must not exceed the system’s power supply +5 V maximum 
current.