the G4 upgrade is unstable at best in a Beige G3 system. you would prolly be more happier with that G3 1ghz upgrade. allot of lockup's in Os 9.2.2 slow performance in OS 9.2.2 and OS X cause even tho the software is installed sometimes it only uses 32k out of the 64k available for the L1 cache and sometimes it uses no L2 cache and it showes up as a 60x series of cpu. that is cause the rom and OF only has info for the 60x and G3 cpu's. it will use altvec tho but that wont help much if the cpu is only halfway seen by the system.

i dont know how many people on http://discussions.apple.com complain about the software to enable the G4 1ghz zif upgrade in OS 9. cause you have to remove allot of extensions from the system that basically makes it almost unusable.

i would rather stick with a G3 upgrade in a Beige G3 than go with the G4 upgrade. now if it was a B&W or Yikes G4 then i would upgrade to that cpu cause you can flash the B&W to be able to see a G4 in OF. and the yikes G4 system already supports a G4 cpu and both will see a G4 CPU fully but the system bus will be slowed down to 66mhz due to a bug in the grackle IC