[just to confuse or clarify things a bit. :)]
Each subsystem has limitations, which become bottlenecks during one type of load or another. So it pays to target your upgrades at the subsystem most critical to your specific task load.
Yep, and the achilles heel of the g4 is is it's miserable bus bandwidth. Last I heard the CPU bus could not even keep up with DDR memory.
As for the G5, moving 64 bit addresses around takes longer and used more power than moving a 32 bit address. If you need lots of memory space and/or need to work with big numbers then a 64 bit CPU has an advantage. Otherwise, your better off with a 32 bit CPU. I think a really advanced g4 makes more sense for a PowerBook. Maybe IBM will come to rescue as Motorola is certainly not going anywhere fast.
Paul
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