For the record, the chip that had expanded was not the GPU. The G3's had GPU issues, it was a different, smaller chip on the G4. (Not sure which one, I only had a quick look) What I can tell is that unlike the G3 issue, it isn't a ball grid array solder job, just surface mount IC legs.

They look nice though and perform quite well. A bit of a statement, turning up for class with the nice white iBook in the field of Dells and HP's. Stands out.