Equipment Log and Power Consumption Worksheets 85
Current Usage ✏ NOTE
Both processors pull power from +12V. This may limit the number of drives
and/or add-in cards you may install.
The average power usage should not exceed 15 watts per PCI slot.
The cooling efficiency varies per slot; therefore, ensure that adequate cooling is available in the
target slot-especially in an expansion slot dissipating more than 10 Watts.
Calculating Power Consumption
The total combined wattage for the system configuration must be less than the output of your power
supply. Use the two worksheets in this section to calculate the power used by your server boards.
For current and voltage requirements of add-in boards and peripherals, see your vendor documents.
Worksheet, 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.
Table 18. Power Usage Worksheet 1
Current (maximum) at voltage level:
Device +3.3 V 3.3 V Standby +5 V 5 V Standby +12 V -12 V
Server board 6.6 A 0.0 A 2.6 A 1.5 A .5 A 0.0 A
Primary Processor
Secondary Processor
Memory (six DIMMs)
Full-Height PCI riser slot
(see note 1)
PCI slot 1
PCI slot 2
PCI slot 3
Low-Profile PCI riser slot
(see note 1)
PCI slot 1
PCI slot 2
PCI slot 3
Server Board Current
SUBTOTALS
System Components
(see note 2)
Total Current
Note 1: Number of PCI cards depends on system and riser card configuration.
Note 2: List additional system devices and associated currents.