IBM has posted an extensive technical article on running Linux on a Power Mac G5. “For many Linux users, the best reason to buy an Apple Power Mac G5 machine will be, quite simply, the well engineered, high-performance, and reasonably priced machines available from Apple. Many enterprises, hosting companies, schools, and research facilities have a mixture of x86 and PowerPC systems that they provide to users. When you want to assure a uniform system/user interface across these machines, Linux is the best choice for an operating system. PowerPC 970-based machines are comparable in performance to AMD’s Athlon64 and Opteron and to the Intel Pentium 4EE and Xeon.”