Specifications

100 Appendix A
Power Supply
AC line input
m Line voltage/current: 100–120 V alternating current (AC), 8 amperes (A) or 200–240 V AC,
4.5 A, single phase, manually set by voltage selector switch or set automatically depending
on the type of supply
m Frequency: 50–60 hertz (Hz)
DC monitor output
m 4.0 A maximum at 25 V DC from the Apple Display Connector
Power Requirements for Devices You Can Connect
Expansion cards
m Maximum power consumption by the AGP card is 20 W.
m Maximum power consumption by four PCI cards and the AGP card combined is 80 W.
USB devices
m Each of the computer’s built-in USB ports is allotted 500 mA.
FireWire devices
m The computer can provide up to 15 W total to the FireWire ports.
System Clock and Battery
m CMOS custom circuitry with long-life lithium battery. You can replace the computer’s
battery (see “Replacing the Battery” on page 85) with a new one purchased from an
Apple-authorized dealer.