Intel D845PT Intel Desktop Board D845PT/D845BG Product Guide - Page 21

CAUTION, Location of Standby Power Indicator

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Desktop Board Features CR3F1 OM12625 Figure 3. Location of Standby Power Indicator CAUTION If the standby current necessary to support multiple wake events from the PCI and/or USB buses exceeds power supply capacity, the desktop board may lose register settings stored in memory. Power supplies used with this board must be able to provide enough standby current to support the standard Instantly Available (ACPI S3 sleep state) configuration as outlined in Table 4. Values are determined by specifications such as PCI 2.2. Actual measurements may vary. To estimate the total amount of standby current required for a particular system configuration, standby current requirements of all installed components must be added. Refer to the descriptions in and follow the steps outlined below: 1. Note the total D845PT or D845BG board standby current requirement. 2. Add to that the total PS/2 port standby current requirement if a wake-enabled device is connected. 3. Add, from the PCI 2.2 slots (wake-enabled) row, the total of the number of wake-enabled devices installed (PCI and AGP) multiplied by the standby current requirement. 4. Add, from the PCI 2.2 slots (non-wake-enabled) row, the total of the number of non-wake- enabled devices installed (PCI and AGP) multiplied by the standby current requirement. 5. Add all additional wake-enabled devices' and non-wake-enabled devices' standby current requirements as applicable. 6. Add all the required current totals from steps 1 through 5 to determine the total estimated standby current power supply requirement. 21

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Desktop Board Features
21
OM12625
CR3F1
Figure 3.
Location of Standby Power Indicator
CAUTION
If the standby current necessary to support multiple wake events from the PCI and/or USB buses
exceeds power supply capacity, the desktop board may lose register settings stored in memory.
Power supplies used with this board must be able to provide enough standby current to support the
standard Instantly Available (ACPI S3 sleep state) configuration as outlined in Table 4.
Values are
determined by specifications such as PCI 2.2.
Actual measurements may vary.
To estimate the total amount of standby current required for a particular system configuration,
standby current requirements of all installed components must be added.
Refer to the descriptions
in and follow the steps outlined below:
1.
Note the total D845PT or D845BG board standby current requirement.
2.
Add to that the total PS/2 port standby current requirement if a wake-enabled device is
connected.
3.
Add, from the PCI 2.2 slots (wake-enabled) row, the total of the number of wake-enabled
devices installed (PCI and AGP) multiplied by the standby current requirement.
4.
Add, from the PCI 2.2 slots (non-wake-enabled) row, the total of the number of non-wake-
enabled devices installed (PCI and AGP) multiplied by the standby current requirement.
5.
Add all additional wake-enabled devices
’
and non-wake-enabled devices
’
standby current
requirements as applicable.
6.
Add all the required current totals from steps 1 through 5 to determine the total estimated
standby current power supply requirement.