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Hello,

> Taking a guess here is it possible that memory that worked fine for
> a 604e/200 would be too slow for G4/350?  Or, since I don't have
> MacOS on this system does the install software for the upgrade
> do something in OpenFirmware?

Maybe. I had a similar problem with a 300MHz G3 card - it ran the bus at
50MHz while the old dual 604e ran it as 43.something MHz. The result was
that some slower memory modules started to show outages after a while
and after taking them out the machine is rock stable again ( 'only'
400MB RAM left - I think I can live with that ;) )

So, my recommendation:
- check at which speed your CPUs run the bus. Most 604 run at less than
50MHz, most G3 or G4 upgrades use 50MHz, some can use more which would
count as overclocking.
- if you have lots of different RAM modules take a few slower ones (
70ns or more )  out and see if that makes a difference.
- if the G4 uses 50MHz and taking out slow RAM didn't help have a look
at the CPU card - most have some way to set bus clock and multiplier.
- if it uses more than 50MHz it's out of spec, the maximum is 50MHz and
even at this speed some mainboards have problems.
- if you have cache on the mainboard try to disable it - NewerTech has a
nice, free utility which works with lots of other CPU upgrades as well,
like my Phase5 G3. It requires MacOS though.=20

have fun
Michael

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