Power Supply; Power Supply Considerations; Power Usage; Dc Voltage Tolerances And Estimated Current Requirements (No Pci Or A.g - Intel MS440GX Product Manual

MS440GX Motherboard Product Guide

Power Supply

Table 9 lists the power specifications for a computer that contains a motherboard with two
400 MHz Pentium II Xeon processors, 128 MB SDRAM, a 3.5-inch diskette drive, an WD Caviar
3320 3.3 GB Ultra ATA hard drive, a Hitachi CPR 8330 IDE CD-ROM, and a Diamond Viper
330 A.G.P. graphics card. 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 1280x1024x256 colors and 70 Hz
refresh rate. AC watts are measured with a typical 300 W supply, nominal input voltage and
frequency, with true RMS wattmeter at the line input.
Table 8.

Power Usage

Mode
Windows 98 desktop
Windows NT 4.0 desktop

Power Supply Considerations

For typical configurations, the motherboard is designed to operate with at least a 300 W power
supply. A higher-wattage power supply should be used for heavily-loaded configurations. The
power supply must comply with the following recommendations:
The potential relation between 3.3 V DC and +5 V DC power rails
The current capability of the +5 VSB line
All timing parameters
Must meet UL SELV requirements and meet the 240VA energy limit
Table 9. DC Voltage Tolerances and Estimated Current Requirements (no PCI or A.G.P.
shown)
DC Voltage
+3.3 V
+5 V
+5 VSB (standby)
-5 V
+12 V
-12 V
NOTE
Some heavily loaded configurations could require additional +3.3 V and +5 V power for
peripherals. Use the auxiliary power supply connector for this purpose.
26
Estimated current with a 400
Acceptable MHz processor, 512 KB
Tolerance cache, and 2 GB RAM
5% 20A
5% 14A
5% 0.72A
10% 0.0A
5% 2.8A
10% 0.0A
Watts (AC) Out of AC Wall Outlet
60 watts
92 watts
Estimated current with a 450
MHz processor, 512 KB
cache, and 2 GB RAM
20A
16A
0.72A
0.0A
3.1A
0.0A