On 3/18/2011 11:08 AM, Timothy Murphy wrote:
> Les Mikesell wrote:
>
>> I've seen memtest take 3 days to find bad RAM.  Sometimes only certain
>> patterns/timing will fail.
>
> The standard memtest86+ completes in about 90 minutes
> on all the computers I have.
> As far as I can see, it just starts again and runs the same tests
> if you leave it running.

I think it cycles a different pattern on each run.

> Also, when I have a bad memory module, as in this case,
> I get hundreds of errors in Test 2, after a couple of minutes.

There are different failure modes.  Some only show up when there is a 
certain pattern in adjacent bits.  And you may have 1-bit ECC covering 
up some failures but not able to cope with them all.  In theory, ECC is 
supposed to halt the machine on an uncorrectable failure but I've seen 
that fail too.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

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