Re: Memory??? problems

In article <1hepaj7.v3mkij8grfnzN%see_signature@xxxxxxxxxxxxxxx>,
see_signature@xxxxxxxxxxxxxxx (Jon) wrote:

*** Sidbury <DrJamesSidbury@xxxxxxxxxxx> wrote:

If the intermittent problem does NOT show up, can someone
suggest a way of determining which if either memory chip may be at
fault. Or other suggestions about what else to try and diagnose.

In certain cases it may actually not be either module, but the
combination of modules..

An example is where you have two slightly different ram speeds. Many
machines will accept faster memory than specified, but may have problems
if you mix the standard speed and the faster one. There may be other
cases I didn't hear of, too. I recall there was a very strange thing
like that with some of the first TiBooks, where RAM that looked
perfectly OK on paper and that worked in some, didn't work in others.
Evidently there is more to ram chips than we mortals usually see...

I've finally traced the problem. What I did is put my original 512
module in and run the computer from about 9 am until I went home. Then
I swapped it out and replaced it with one of my other modules. The
system froze after about an hour. I then swapped that module out and
put in the third module and the system ran the rest of the evening and
overnight and then went to sleep (at my request) while on the way to
work. It worked fine, so I put back in the module that had crapped out
after an hour. The system froze within 10 minutes. We had used some
end of fiscal year money to buy a 1 gig ram stick (for my powerbook it
was a DDR2 PC-4200 533 bus) chip. We purchased a Corsair Value Select
module since it seemed to satisfy the specs. When I found the problem I
went to Corsair's site to register a complaint and ask to have the
module replaced. I was essentially told that their "value select" ram
didn't work in a powerbook. I should have instead have purchased their
other PC-4200 ram (which was twice as expensive). We are hoping to
return it and exchange it for Transcend memory since that's the kind we
purchased previously and it seemed to work OK. Since we bought it at
Newegg only about a week ago, I'm hoping that they will allow us to
exchange it at no real extra cost.

***
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