Intel S975XBX2 Product Specification - Page 71

Fan Header Current Capability, Power Supply Considerations

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Technical Reference 2.10.3 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 34 lists the current capability of the fan headers. Table 34. Fan Header Current Capability Fan Connector Processor fan Front chassis fan Rear chassis fan Auxiliary rear fan MCH fan (optional) Maximum Available Current 3.0 A 1.5 A 1.5 A 3.0 A 1.5 A 2.10.4 Power Supply Considerations CAUTION The +5 V standby line for the power supply must be capable of providing adequate +5 V standby current. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options. System integrators should refer to the power usage values listed in Table 33 when selecting a power supply for use with the board. Additional power required will depend on configurations chosen by the integrator. The power supply must comply with the following recommendations found in the ATX form factor specification. • The potential relation between 3.3 VDC and +5 VDC power rails • The current capability of the +5 VSB line • All timing parameters • All voltage tolerances 71

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Technical Reference
71
2.10.3
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 34 lists the current capability of the fan headers.
Table 34. Fan Header Current Capability
Fan Connector
Maximum Available Current
Processor fan
3.0 A
Front chassis fan
1.5 A
Rear chassis fan
1.5 A
Auxiliary rear fan
3.0 A
MCH fan (optional)
1.5 A
2.10.4
Power Supply Considerations
CAUTION
The +5 V standby line for the power supply must be capable of providing adequate
+5 V standby current.
Failure to do so can damage the power supply.
The total
amount of standby current required depends on the wake devices supported and
manufacturing options.
System integrators should refer to the power usage values listed in Table 33 when
selecting a power supply for use with the board.
Additional power required will depend on configurations chosen by the integrator.
The power supply must comply with the following recommendations found in the ATX
form factor specification.
•
The potential relation between 3.3 VDC and +5 VDC power rails
•
The current capability of the +5 VSB line
•
All timing parameters
•
All voltage tolerances