The important question is whether the RAM has been tested and is guaranteed compatible with the iBook?
The KVR333 RAM has not -- this is Kingston's generic PC part.
The Micron we don't know, because Micron does not sell direct, they are an OEM, so they do not guarantee compatibility with anything, it's up to the reseller to do so.
Same situation with the AZen RAM, this is a generic chip.
The problem is that the chip organization must be correct and the Serial Presence Detect settings on the module must be set correctly for the iBook.
Peter: iBook G4s take PC2100 if they are pre-latest version. The 1.42 MHz and the new 12" 1.33 take PC2700. iBook G3s take PC133 or PC100 SDRAM.
But: The specification alone is nowhere near enough to determine compatibility. I recommend purchasing from a dealer who tests and guarantees compatibility with your model Mac, offers a lifetime warranty and a no-cost return if it doesn't work.
Thanks
Trevor
CanadaRAM.com