@ Unknown_K: I have no idea where to get stuff like that locally. There are some shops that'll do the work for you, as there are for repairing the BGA GPU on defective iBook logic boards. I'm not willing to pay for it, though.
@ Bunsen: It depends on the model. The 54/6400 had 120, 140, 160, 180 and 200MHz QFP chips, while the 7220/4400 had 160 and 200MHz BGA chips, and 55/6500s had 225, 250, 275, and 300MHz chips. Clones were variable, as well, but most Tanzania boards were BGA.
It's not hard to change the clock frequency of many of the later models, particularly the Tanzania clone boards (which are designed for multiple 603/604 configurations) and Gazelle models: it's just a couple of resistors to change the clock speed. Much easier than trying to figure out the clock config on a PB 5300...
@ Bunsen: It depends on the model. The 54/6400 had 120, 140, 160, 180 and 200MHz QFP chips, while the 7220/4400 had 160 and 200MHz BGA chips, and 55/6500s had 225, 250, 275, and 300MHz chips. Clones were variable, as well, but most Tanzania boards were BGA.
It's not hard to change the clock frequency of many of the later models, particularly the Tanzania clone boards (which are designed for multiple 603/604 configurations) and Gazelle models: it's just a couple of resistors to change the clock speed. Much easier than trying to figure out the clock config on a PB 5300...