don't think for a minute that all PowerMacs have the same chipsets, for example a "candy" iMac is probably not going to have the same NB controller as an eMac, or one of the server G4 Macs.
Why not? You really think Apple are going to sepnd serveral $million designing a new Northbridge for every new model?
They may enhance NorthBridges but even then they'll still be based on the previous version.
The G5 NB will be different but only because it needs to be.
