Specifications

80 Chapter 5
Installing a PCI Expansion Card or Replacing the AGP Card
You can expand the capabilities of your Power Mac G4 by installing cards in its expansion slots.
The computer has five expansion card slots, four of which accommodate peripheral component
interconnect (PCI) cards and one that accepts an advanced graphics port (AGP) card.
AGP cards and PCI cards have different connectors, so you cannot insert a PCI card into the
AGP slot.
About AGP Cards
Your AGP card, installed in slot 1, provides the computer’s monitor port. Slot 1 is designed
specifically to accept AGP cards that have a 32-bit data width. This 66 megahertz (MHz) slot
accommodates 3.3 volt (V) AGP cards (see the illustration on page 82).
You can replace the card that came with the computer with an AGP 1X card, 2X card, or 4X
card. A replacement AGP card must have a driver compatible with the Mac OS.
About PCI Expansion Cards
Your Macintosh has four expansion slots, labeled 2, 3, 4, and 5, which accept PCI cards up
to 12 inches long. Some models come with a SCSI PCI card installed in one of these slots.
Install only expansion cards that come with Macintosh driver software and that comply with
the PCI 2.1 standard.
The PCI slots can accommodate mixed voltage (5.0 V, 12 V, or 3.3 V) cards with 32-bit or
64-bit data widths and a 33 MHz frequency. You can add a 66 MHz card to a PCI slot if the
card can operate at the lower 33 MHz rate.
Maximum power consumption for all five expansion slots (the four PCI expansion cards and
the AGP card) should not exceed 80 watts (W).
Warning Do not use cards that function only at 66 MHz in the PCI slots. Damage to your
equipment could result. If you have a 66 MHz card, check the card’s manufacturer to see
if it also works at 33 MHz.