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The PCI slots on the server board are rated at a maximum of 5 amperes per slot. The
maximum power allowed for each slot is 20 watts at +5 volts. The average current usage
per slot should not exceed 3.0 amperes per slot (that is 15 watts).
The cooling efficiency varies per slot; therefore, ensure that adequate cooling is available
in the target slot, especially in an expansion slot drawing more than 2.0 amperes.
Calculating Power Consumption
The total combined wattage for the system configuration must be less than the output of
the power supply. Use the two worksheets in this section to calculate the power used by
the server boards. For current and voltage requirements for add-in boards and
peripherals, see your vendor documents.
Worksheet for Calculating DC Power Usage
1
List the current for each board and device in the appropriate voltage level column.
2
Add the currents in each column then go to the next worksheet.
Device
Server board
Primary processor
Secondary processor
(if present)
Terminator card, if no
second processor
Memory (four 128-MB
DIMMs)
PCI slot 1
PCI slot 2
1st 3.5-inch hard disk drive
2nd 3.5-inch hard disk
drive
3rd 3.5-inch hard disk
drive
4th 3.5-inch hard disk drive
3.5-inch diskette drive
CD-ROM drive
Cooling fan 1
Current (Maximum) at Voltage Level:
+3.3 V
+5 V
1.0 A
8.0 A
1.6 A
1.8 A
0.3 A
Current (Maximum) at Voltage Level:
–5 V
+12 V
0.1 A
1.1 A
.300
179
–12 V
0.4 A
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