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Technical Reference
Table 18.
DC Loading Characteristics Mode
Minimum Loading
Maximum Loading
3.9.2
Add-in Board Considerations
The CRB is designed to provide 2 A (average) of +5 V current for each add-in board.
There is a total of three x4 PCI Express* slots and one PCI 32/33 add-in board.
3.9.3
Fan Connector Current Capability
Warning:
The processor fan must be connected to the processor fan connector, not to a chassis
fan connector. Connecting the processor fan to a chassis fan connector may result in
on-board component damage that will halt fan operation.
Table 19.
Fan Connector Current Capability
Fan Connector
CPU Fan
Fan 1
Aux Fan 0
Aux Fan 1
3.9.4
Power Supply Considerations
Warning:
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.
The power supply must comply with the following recommendations found in the
indicated sections of the ATX form factor specification.
• The voltage relationship between 3.3 VDC and +5 VDC power rails
• The current capability of the +5 VSB line
• All timing parameters
• All voltage tolerances
3.10
Thermal Considerations
This CRB features a thermal protection circuit in the processor voltage regulator area.
This circuit protects the processor voltage regulator from overheating and damaging
the CRB. Please consult the specific processor datasheet for details about the thermal
runoff features supported by the processors paired with the Intel
triggering temperature level causes the processor to enter a throttling mode (slowing
down the processor if it exceeds its maximum operating temperature) and allow the
processor voltage regulator to cool down.
January 2007
Order Number: 315879-002
DC Power
+3.3 V
300 W
5 A
500 W
25 A
Maximum Available Current
3.0 A
3.0 A
3.0 A
3.0 A
Dual-Core Intel® Xeon® Processor LV and Intel
DC Current at:
+5 V
+12 V
-12 V
11 A
19 A
27 A
36 A
0.40 A
®
3100 Chipset. The
+5 VSB
0.34 A (S0)
0 A
1.25 A (S3)
0.34 A (S0)
1.25 A (S3)
®
3100 Chipset
User's Manual
49
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