Technical Reference
73
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
DC Current at:
Mode AC Power +3.3 V +5 V +12 V -12 V +5 VSB
Windows 98 APM full on 88.6 W 3.95 A 1.0 A 0.68 A -0.27 A 0.18 A
Windows 98 APM Suspend 54.3 W 3.96 A 0.99 A 0.30 A -0.24 A 0.14 A
Windows 98 ACPI S0 57.6 W 3.91 A 0.99 A 0.30 A -0.26 A 0.21 A
Windows 98 ACPI S1 54.1 W 3.88 A 0.89 A 0.31 A -0.27 A 0.21 A
Windows 98 ACPI S3 4.1 W 0.0 A 0.0 A 0.0 A 0.0 A 0.37 A
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.
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