2. Do not install an Apple PCI Ethernet card without connecting a network cable.
3. If you configure an Apple PCI Ethernet Card by assigning it an IP address or by enabling the AppleTalk stack on it, the card attempts to determine which of the three possible media types is connected to it. If you have not connected a network cable, you will hear clicking sounds every few seconds. These clicking sounds will continue until the cable is connected. Although this should cause no serious problems, the lack of a cable may cause long pauses during system booting, as the system attempts to contact other servers on the network.
4. For maximum performance, always install Ethernet cards from the bottom slot up; slot 6 before slot 5, and so on.