![]() |
PATH![]() |
This section lists the power requirements for ADB devices, audio and telecommunications devices, PCI expansion cards, and internal storage devices.
The following table shows power allowances for external devices connected to input ports.
Microphone | +5 V | 20 mA | 100 mW |
A device connected to the printer port or modem port | +5 V | 500 mA | 2.5 W |
If you add an expansion card or a 3.5-inch storage device to your computer, make sure the component's power requirements don't exceed the maximum power allowances allocated to it by the computer.
The maximum power allowances for expansion cards in your computer can accommodate three 15-watt cards, two 25-watt cards, or one 15-watt card and one-25 watt card. Some detailed guidelines are presented in the following table.