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2.11 Electrical Considerations
2.11.1 Power Consumption
Table 51 lists voltage and current measurements for a computer that contains the D850GB board
and the following:
•
1.4 GHz Intel Pentium 4 processor with a 256 KB cache
•
96 MB RDRAM
•
3.5-inch diskette drive
•
6.4 GB IDE hard disk drive
•
40X IDE CD-ROM drive
This information is provided only as a guide for calculating approximate power usage with
additional resources added.
Values for the Windows 98 desktop mode are measured at 640 x 480 x 256 colors and 60 Hz
refresh rate. AC watts are measured with the computer is connected to a typical 200 W power
supply, at nominal input voltage and frequency, with a true RMS wattmeter at the line input.
NOTE
Actual system power consumption depends upon system configuration. The power supply should
comply with the recommendations found in the ATX12V Specification (see Table 3 on page 16 for
specification information).
Table 51.
Power Usage
Mode
Windows 98 APM full on
Windows 98 APM Suspend
Windows 98 ACPI S0
Windows 98 ACPI S1
Windows 98 ACPI S3
2.11.2 Add-in Board Considerations
The D850GB board is designed to provide 2 A (average) of +5 V current for each add-in board.
The total +5 V current draw for add-in boards in a fully-loaded D850GB board (all six expansion
slots filled) must not exceed 12 A.
AC Power
+3.3 V
+5 V
88.6 W
3.95 A
1.0 A
54.3 W
3.96 A
0.99 A
57.6 W
3.91 A
0.99 A
54.1 W
3.88 A
0.89 A
4.1 W
0.0 A
0.0 A
Technical Reference
DC Current at:
+12 V
-12 V
0.68 A
-0.27 A
0.30 A
-0.24 A
0.30 A
-0.26 A
0.31 A
-0.27 A
0.0 A
0.0 A
+5 VSB
0.18 A
0.14 A
0.21 A
0.21 A
0.37 A
73
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