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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > Why does powerbook have such low FSB?

Why does powerbook have such low FSB?
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Dedicated MacNNer
Join Date: Aug 2004
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Apr 12, 2005, 02:40 AM
Can someone explain that a little bit?Low FSB=Low performance?
thank you.
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Mac Elite
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Apr 12, 2005, 03:13 AM
Because it uses a G4, and the G4 can't currently handle technologies that would give it a high frontside bus.
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Apr 12, 2005, 08:45 AM
The PPC 74xx aka G4 uses a so-called MaxBus which is limited to 167MHz.

There were rumors about a successor called 7448 which should have a new bus running at up to 200MHz and a dual-core freescale PPC with true 400MHz DDR support. Whatever.

The G5s used by Apple run their bus at half respectively a third of their core frequency.
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