Specifications

This chapter describes the architecture of the Power Mac G5. It includes information about the major components

on the logic boards: the microprocessor, the other main ICs, and the buses that connect them to each other

and to the I/O interfaces.

Block Diagram and Buses

The architecture of the Power Mac G5 is based on the PowerPC G5 microprocessor, and two custom ICs: the

U3H memory controller and bus bridge and the K2 I/O controller.

Figure 2-1 (page 18) is a simplified block diagram of the dual processor 2.0 GHz Power Mac G5. The diagram

shows the U3H and K2 ICs and the buses that connect them together.

Architecture