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2.11 Electrical Considerations
2.11.1 Power Consumption
Table 52 lists voltage and current measurements for a computer that contains the desktop board
D850EMD2/D850EMV2 and the following:
•
1.7 GHz Intel Pentium 4 processor with a 256 KB cache
•
128 MB PC800 ECC RDRAM
•
AGP 4X/2X video card
•
3.5-inch diskette drive
•
11.5 GB IDE hard disk drive
•
36X 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 SE desktop mode are measured at 640 x 480 x 256 colors and 60 Hz
refresh rate. AC watts are measured with the computer connected to a typical 250 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 1.5 for specification information).
Table 52.
Power Usage
Mode
Windows 98 SE ACPI S0
Windows 98 SE ACPI S1
Windows 98 SE ACPI S3
2.11.2 Add-in Board Considerations
The desktop boards D850EMD2/D850EMV2 are 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 is as follows:
•
For a fully loaded desktop board D850EMD2 (all four expansion slots filled), the total +5 V
current draw must not exceed 8 A.
•
For a fully loaded desktop board D850EMV2 (all seven expansion slots filled), the total +5 V
current draw must not exceed 14 A.
AC Power +3.3 V
+5 V
69 W
2.6 A
2.3 A
63 W
2.5 A
2.3 A
3 W
0 A
0 A
Technical Reference
DC Current at:
+12 V
-12 V
1.5 A
0 A
1.4 A
0 A
0 A
0 A
+5 VSB
0.3 A
0.3 A
0.4 A
79
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