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350 Watt Power Supply
As an overall current usage limitation on the power subsystem, do not exceed a combined power
output of 195 watts for the +5 V and +3.3 V outputs. Exceeding a combined 195 watts will
overload the power subsystem and may cause the power supplies to overheat and malfunction.
Calculating Power Usage
The total combined wattage for your configuration must be less than 350 watts. Use the two
worksheets in this section to calculate the total used by your configuration. For current and
voltage requirements of add-in boards and peripherals, see your vendor documents.
Worksheet, Calculating DC Power Usage
Table 7.
350 Watt Power Usage Worksheet 1
Device
Baseboard, Front Panel
board and Fans
Processor(s)
Memory
3.5-inch diskette drive
CD-ROM drive
Second 5.25-inch device
Third 5.25-inch device
1st hard drive
2nd hard drive
3rd hard drive
4th hard drive
5th hard drive
6th hard drive
SCSI Backplane
Expansion Board 1
Expansion Board 2
Expansion Board 3
Expansion Board 4
Expansion Board 5
Expansion Board 6
Expansion Board 7
Total Current
Maximum Ratings
(for comparison)
Equipment Log and Worksheets
Current (maximum) at voltage level:
+3.3 V
+5 V
–5 V
+12 V
1.3
28 A
32 A
NA
15 A
–12 V
5V standby
.5 A
.8 A
67
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