Technical Reference
77
2.11 Electrical Considerations
2.11.1 Power Consumption
Table 52 and Table 53 list voltage and current measurements for a computer that contains the
D815EEA board and the following:
• 667 MHz Intel Pentium III processor with a 512 KB cache
• 128 MB SDRAM
• 3.5-inch diskette drive
• 1.6 GB ATA-33 IDE hard disk drive
• 24X 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 ATX Form Factor Specification document (see
Table 3 on page 16 for specification information).
Table 52 lists the power usage for a D815EEA board with the configuration listed above and
including the basic audio subsystem and the onboard LAN subsystem.
Table 52. Power Usage For Board with Basic Audio and Onboard LAN
DC Current at:
Mode AC Power +3.3 V +5 V +12 V -12 V +5 VSB
Windows 98 APM full on 51 W 1.96 A 2.30 A 0.10 A 0.00 A 0.17 A
Windows 98 APM Suspend 35 W 1.92 A 0.58 A 0.10 A 0.00 A 0.16 A
Windows 98 ACPI S0 29 W 1.81 A 0.59 A 0.11 A 0.02 A 0.18 A
Windows 98 ACPI S1 24 W 1.77 A 0.59 A 0.11 A 0.02 A 0.18 A
Windows 98 ACPI S3 1 W 0.0 A 0.0 A 0.0 A 0.0 A 0.31 A
Windows 98 ACPI Off 0 W 0.0 A 0.0 A 0.0 A 0.0 A 0.18 A
Table 53 lists the power usage for a D815EEA board with the configuration listed above and
including the enhanced PCI audio subsystem, but no onboard LAN subsystem.
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