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Desktop Board Features
19
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, etc.
Calculate the standby current requirements using the steps described below.
Power supplies used with this desktop board must be able to provide enough standby current to
support the standard Instantly Available (ACPI S3 sleep state) configuration as outlined in Table 6.
Some values are set per specifications such as PCI 2.2. The values given in the table for Instantly
Available are for a system containing a single wake-enabled PCI (or AGP) device and five
non-wake devices. Actual measurements may vary.
Estimating Standby Current
CAUTION
Power supplies used with the board must provide enough standby current to support the Instantly
Available (ACPI S3 sleep state) configuration. If the standby current necessary to support
multiple wake events from the PCI and/or USB buses exceeds power supply capacity, the board
may lose register settings stored in memory and may not awaken properly.
To estimate the standby current required for a specific system configuration, the standby current
requirements of all installed components must be combined. Refer to Table 6 and follow these
steps:
1. List the board’s standby current requirement (767 mA).
2. List the PS/2 ports’ standby current requirement (see note).
3. List, from the AGP and PCI 2.2 slots (wake enabled devices) row, the total number of wake-
enabled devices installed and multiply by the standby current requirement.
4. List, from the AGP and PCI 2.2 slots (non-wake enabled devices) row, the total number of
wake-enabled devices installed and multiply by the standby current requirement.
5. List all additional wake enabled devices’ and non-wake enabled devices’ standby current
requirements as applicable.
6. Add all the listed standby current totals from steps 1 through 5 to determine the total estimated
standby current power supply requirement.