It's the case with all the G4's we've tested.  Although not an exhaustive
list of G4's it is a pretty large sampling.  We've tested Sawtooth, Yikes
and the newer model dual G4's.  It is possible to not use the IDE at all
and get much better timing.  I've done with with initrd and NFS root.

I haven't tried any other IDE cards but you could reasonably drop in
another IDE card and probably get better results.

} Is that the case with *all* G4 Macs? Is it possible to disable the interface 
} (or just not fire it up) and use an IDE (UDMA/100?) card instead? (Under 
} Linux, that is.)

Do you need better timing that 16us worst-case?  If so, I'd suggest testing
with an alternate card.

If you need better timing than 16us on a workstation a fast x86 should work
for you.

} Any news in that area?
} 
} I'm thinking about G4 based *workstations* here, to use with Linux, XFree86 
} and KDE, preferably. Fast HD interface and lots of fast memory are important 
} features, as well as an AGP port for a serious video card, like the Matrox 
} G400. Need 350 MHz+ RAMDAC.
} 
} (I'm not going to buy one tomorrow, so I'd be interested in hints as to 
} what's coming up as well...)
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