Hello Everyone,

I've been away from the list for just about exactly a year.  How time 
flies.  So many changes in a year!

Anyway, last week I bought a DayStar, XLR8 400 mHz, G4 ZIF processor to 
replace the 266 mHz G3 one that I had in my XLR8 carrier card that is 
plugged into my S900.  The installation of the new processor went easily 
with no problems, however, attempts to overclock the new one over the 
400 mHz were unsuccessful.  I was able, using software, to set the bus 
speed that the processor uses to access the cache on the processor card 
from the default 200 mHz to 265 mHz.

The instructions that came with the processor said to let it run for 24 
hours to test for system stability or whatever, to make sure everything 
was functioning property.  They said to give the processor a task such 
as running Gauge Pro which will continuously test the memory of the 
machine.  I set up Gauge Pro and bang... bang... bang... it reported a 
multitude of errors in writing and reading my memory.  I set the cache 
bus speed back down to default but that had no effect, the memory errors 
continued.  I haven't had any symptoms of memory problems in the 736 mb. 
that I installed in an interleaved pattern over a year ago.  I haven't 
had a crash or data loss in all that time.  Norton System Works is 
running in the background, checking at startup and shut down, and never 
reporting problems. 
The majority of memory that I have was purchased over a year ago from 
Velocity Upgrades when they were having those great sales on 128 mb. 
sticks.  I painstakingly did the RAM sandwich technique with all of it, 
sending back some that tested bad, until I was satisfied that all the 
memory in my S900 was solid and good.  And now with retesting a year 
later, I am getting so many memory errors.

My questions:  Can memory go bad, out of the blue, so to speak?  Could 
my original testing methods have been flawed to where I missed the bad 
memory (I let the Gauge Pro run for thousands of passes)?  Could the 
memory error messages be related to the installation of this new G4 ZIF 
processor?  Could the memory be OK and Gauge Pro be hiccoughing?

How do I begin testing to determine which memory sticks are good and bad 
in order to develop the RAM sandwich outer modules?  Do I pull all of 
the memory out except one stick and test that, one by one? or do I test 
by pulling one module out at a time and testing the remaining modules as 
a group until I get no error messages?

I'm not going to run any tests until I hear from you all with your power 
brain ideas for me.  Unless this list has changed, this is one of the 
deepest wells of experience and information available on supermacs and 
electronics in general.

As usual, I appreciate any information, direction, speculation, theory, 
or past experiences that anyone is willing to offer.

Thanks a bunch,
Bob Robeson



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