Technical Reference
79
2.11 Electrical Considerations
2.11.1 Power Consumption
Table 55 lists voltage and current measurements for a computer that contains the Desktop Board
D845PEBT2 and the following:
• 2.8 GHz Intel Pentium 4 processor with a 512 KB cache
• 32 MB AGP card
• 512 MB DDR 266 SDRAM
• 3.5-inch diskette drive
• 10 GB IDE hard disk drive
• 12X IDE DVD/40X CD-ROM drive
• IDE Zip
†
drive
This information is provided only as a guide for calculating approximate power usage with
additional resources added.
Values for the Windows XP Professional desktop mode are measured at 32-bit colors, 75 Hz
refresh rate, and screen resolution of 800 by 600 pixels. AC watts are measured with the computer
connected to a typical 300 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/ATX12V Power Supply Design Guide,
Version 1.1 (see Section 1.4 on page 17 for specification information).
Table 55. Power Usage
DC Current at:
Mode AC Power
+3.3 V +5 V +12 V -12 V +5 VSB
ACPI S0 57.00 W 7.02 A
596 mA 1082.3 mA 12.4 mA 288.0 mA
ACPI S1 56.45 W 6.89 A
540 mA 1024.8 mA 12.3 mA 163.3 mA
ACPI S3 3.34 W 4.9 µA
3.1 mA 269.7 µA 325.6 µA 363.6 mA
ACPI S5 3.00 W 5.0 µA
3.1 mA 3.8 µA 56.8 µA 298.2 mA
2.11.2 Add-in Board Considerations
The Desktop Board D845PEBT2 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 for a fully loaded Desktop Board
D845PEBT2 (all five expansion slots and the AGP slot filled) must not exceed 12 A.
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