Calculating Power Usage - Intel AC450NX Product Manual

AC450NX Rack Server System Product Guide

Calculating Power Usage

Use the worksheets in Tables 20-4 and 20-5 to calculate the total DC power used by your server
configuration.
The documentation that comes with each add-in device should specify its current and voltage
requirements.
To calculate the total combined wattage for your server, do this:
1. List the current for each board and device in the appropriate voltage level column in
Table 20-4.
2. Add the currents in each column of Table 20-4, and enter the total current for each column in
Table 20-5.
3. Multiply the voltage by the total current to get the total wattage for each voltage level.
4. Add the total wattage for each voltage level to arrive at a total combined power usage on the
power supply.
Table 20-4. Worksheet for Calculating DC Power Usage
Device
PHP I/O baseboard
16-bit ISA slot, J3B
32-bit primary PCI slot 1, P1
32-bit primary PCI slot 2, P2
32-bit secondary PCI slot 3, P3
32-bit secondary PCI slot 4, P4
32-bit secondary PCI slot 5, P5
32-bit secondary PCI slot 6, P6
64-bit PCI slot 7, P7
64-bit PCI slot 8, P8
64-bit PCI slot 9, P9
64-bit PCI slot 10, P10
CPU baseboard with four 65 W
processors
Primary memory module (16 256MB
DIMMs)
Secondary memory module (16
256MB DIMMs)
3.5-inch diskette drive
CD-ROM drive
1st SCA hard disk drive
2nd SCA hard disk drive
254
Current (maximum) at voltage levels:
+3.3 V + 5V stby +5 V
5 A 0.65 A 4.32 A
4.6 A 6.2 A
13.6 A
13.6 A
0.65 A
0.55 A
+12 V -12 V
0.05 A 0 A
28.5 A
0.60 A
continued