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Current Usage
Calculating Power Usage
The total combined wattage for your configuration must be less than the wattage rating for your
power supply. Use the worksheets in this section to calculate the total used by your configuration.
See the documentation that came with your add-in boards for their current and voltage information.
Worksheet, Calculating DC Power Usage
Table 6. Power Usage Worksheet 1
Current (maximum) at voltage level:
Device +3.3 V +5 V –5 V +12 V –12 V 5 V Standby
Baseboard, Front Panel
Board and Fans
Processor(s)
Memory
3.5-inch Diskette Drive
CD-ROM Drive
1st Hard Drive
2nd Hard Drive
3rd Hard Drive
Expansion Board 1
Expansion Board 2
Intel® Management Module
Local Control Panel
Total Current
✏ NOTE
An online power budget analysis tool is available at http://support.intel.com (search for
“Installation and Use”) to make sure your system falls within the allowed power budget.