NEC Express 5800/140Rb-4, Service Manual

Page: 140 / 145

Calculating Power Consumption
The total combined wattage for the system configuration must be less than the output of your power
supplies. Use the two worksheets in this section to calculate the power used by your system. For
current and voltage requirements of add-in boards and peripherals, see your vendor documents.
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 1. Power Usage Worksheet 1
Current (maximum) at voltage level:
Device +3.3 V +5 V 5 V Standby +12 V -12 V
Server Board Set
Primary Processor
Second Processor
Third Processor
Fourth Processor
Memory
PCI slot 1
PCI slot 2
PCI slot 3
PCI slot 4
PCI slot 5
PCI slot 6
PCI slot 7
PCI slot 8
1
st
3.5-inch Hard Disk Drive
2
nd
3.5-inch Hard Disk Drive
3
rd
3.5-inch Hard Disk Drive
4
th
3.5-inch Hard Disk Drive
5
th
3.5-inch Hard Disk Drive
Combo 3.5-inch Diskette/CD Drive
5.25-inch Peripheral Drive
Fans
Total Current
Equipment Log and Configuration Worksheet 137