Quote:
No progress penalty The PowerPC architecture was designed from the get-go for both 32- and 64-bit processing. That means the Power Mac G5 can run everything you run today, with no performance penalty. Contrast that with the competition, where switching to 64-bit computing will mean costly expenditures for 64-bit software or running a 32-bit operating system in a slow emulation mode. That’s right, current 32-bit Mac OS programs — including Mac OS X itself, the Classic environment and existing applications — run natively at processor speed, with no interruptions to your workflow and no additional investment in software. In fact, Mac OS X applications that take advantage of the PowerPC G4 Velocity Engine will immediately run faster on the G5. Of course, Mac OS X applications tuned for the G5 will run even faster.
-Source: