@Doffo:
It is strange. With 167MHz FSB your system memory speed is a way low... (Mine is too fast, or it is 200MHz in real :) )
As i see you have 1,25GB ram, maybe you can try another test with only 1GB or the 256MB stick.
MorphOS PowerBook G4 1,67GHz, 2GB Ram, 250GBHdd, ATI 9700/128MB
Morphos G5 2,7GHz, 8GB Ram, 500GB Hdd, ATi Passive cooled 9800 PRO/128MB