Intel SR2100, Product Manual

Page: 79 / 96

Equipment Log and Worksheets 79
Current Usage
Calculating Power Usage
The total combined wattage for your configuration must be less than 275 watts, with any
combination of loads not to exceed maximum currents on any one channel as defined in Table 1.
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
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 +5Vsb +3.3 V +5 V –5 V +12 V –12 V
Boards, processors, and
memory (get totals from
your board manual)
SCSI backplane
Front panel board
3.5-inch drive
CD-ROM drive 0.4 A 1.0 A
1st hot swap hard drive
2nd hot swap hard drive
3rd hot swap hard drive
4th hot swap hard drive
Cooling fan 2, 80 mm 0.4 A
Total Current
Maximum Ratings
(for comparison)
2.0 A 14.0 A 20.0 A 0.2 A 14.0 A 0.2 A