Intel MB440LX manual Calculating Power Usage, Total Combined Power Used by Your System

Calculating Power Usage

Use the worksheets in Tables 7-1 and 7-2 to calculate the total DC power used by your system configuration.

The documentation that comes with each add-in board and peripheral device should specify its current and voltage requirements.

To calculate the total combined wattage for your system, do this:

1.List the current for each board and device in the appropriate voltage level column in Table 7-2.

2.Add the currents in each column of Table 7-2, and enter the total current for each column in Table 7-1.

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.

✏Note

The total combined wattage for your system configuration must be less than 360 watts.

Table 7-1. Total Combined Power Used by Your System

Voltage Level and Total Current		Total Watts
	(V X A = W)	for Each Voltage Level
(+3.3	V) X (______ A)	________ W
(+5	V) X (______ A)	________ W
(−5 V) X (______ A)		________ W
(+12	V) X (______ A)	________ W
(–12 V) X (______ A)		________ W
	Total Combined Wattage	________ W

174 Chapter 7 Power System