--- You wrote:
PowerLogix' product is also the only one I've seen that claims to need 
an extension to enable the Altivec unit in the G4, and may have 
something to do with their board design.
--- end of quote ---
You are right, this isn't clear.  Part of the problem is that it isn't easy to
check whether Altivec is activated or not.  There is a program called Altivec
Fractal Carbon Demo  (ree on the web) that runs in 8.6 or up that will tell you
whether Altivec is detected and draw a fractal picture either with or without
the help of Altivec.  The "with" time is at least ten times faster.  Impressive.

This is the only program I know that actually tells you whether you've got
Altivec or not.

Without the Softlogix Altivec activator program, my OWC 466 zif does not run
Altivec in my Beige MT.   With it, it does.

Supposedly, you get Altivec activation by reinstalling os 9.x but, if memory
serves, this did not work for me.  The installer may be reading the machine
identification rather than looking at which processor is present.

OS X automatically activates Altivec.

And both the SoftLogix Altivec enabler and Cache Enabler extensions will crash
os9 if you try to use it as a "classic" system in X.  

Rich

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