84 Ultra Enterprise 450 Server Owner’s Guide • July 1997
4. Calculate the total for each of the following columns: Total Amps @ 3.3 V,
Total Amps @ 5V, and Total Amps @ 12V. Record each sum in the appropriate
spaces in Line 2 at the end of the worksheet.
These figures represent the total DC amps required from each of the three power
supply outputs: +3.3 V, +5 V, and +12 V.
5. Compare the total in Line 2 with the value located immediately above it in Line 1.
You are comparing the total amps per output with the maximum rated value for that
output. The maximum ratings in Line 1 are provided as a pair of values, where the
first value in each pair is for a single power supply and the second value is for a
system configured with two or three power supplies. See the following example.
6. Is the total of each column in Line 2 less than its maximum rated value given in
Line 1?
■ If yes, proceed to Step 7.
■ If no, see “What to Do If Your System Exceeds Power Supply Capacity” on
page 92.
7. Multiply the total DC amps per output recorded in Line 2 with the value
immediately below it in Line 3 and record the results in Line 4.
8. Add the total amps for 3.3 V and 5 V, and record the sum in Line 5.
9. Is the combined value for 3.3 V and 5 V less than 400 W?
If you have two supplies, is the value in Line 5 less than 800 W?
■ If yes, proceed to Step 10.
■ If no, proceed to “What to Do If Your System Exceeds Power Supply Capacity” on
page 92.
Line
No.
Option Qty
+3.3
VDC
Amps
Total
Amps @
3.3 V
+5 VDC
Amps
Total
Amps @
5V
+12
VDC
Amps
Total
Amps @
12 V
1
DC Amp Maximum Rating 47/94 65/130 16/32
2
DC Amp Total Per Output 22.9 36.6 9.9
Step 4. Add totals for each column
and record them in Line 2.
Step 5. Compare values in Lines 1 and 2.
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