So, despite passing the torture test for a few days, it's now failed during normal operation :( Unfortunately I've somewhat lost the desire to investigate further, so I think it's time to buy new mobo, processor, RAM and cooler.

Leo

On 29/05/15 22:02, Full Circle Podcast wrote:
Swapping ram sticks between slots and repeating tests by logical process
of deduction *should* reveal a breakdown and it may only be one
defective chip on the stick, so temperature, running time and usage will
combine to produce an irritatingly intermittent fault.

Engineering and material tolerances aren't what they used to be with
cheaper components.

Two sets of cheap brand new Dell compatible memory failed out of the box
this year looking very like this case.

(power supply issue possible but not what I'd bet on. An old motherboard
heating up and delaminating internally is also possible).

RC

On 19 May 2015 at 21:18, Leo <li...@fractal.me.uk
<mailto:li...@fractal.me.uk>> wrote:

    So with the memory mapping on, the torture test didn't hit any
    errors. So I'm tempted to use this as a short-term solution, and
    then at the weekend I'll looking at swapping the sticks around.

    For anyone that's interested: you can do this (on debian) by editing
    /etc/default/grub and to the line that begins:
    GRUB_CMDLINE_LINUX_DEFAULT=
    add something like:
    memmap=100M\\\$800M
    which will tell the kernel not to use the 100MB of memory starting
    at 800MB.

    Leo

    On 17/05/15 12:13, Neil Stone wrote:

        Before you do... swap them 1 for 1... you can possibly identify
        which
        stick is faulty...

        On 17 May 2015 12:09, "Leo" <li...@fractal.me.uk
        <mailto:li...@fractal.me.uk>
        <mailto:li...@fractal.me.uk <mailto:li...@fractal.me.uk>>> wrote:

             Hmmm, hadn't thought of that either. There's four slots and two
             sticks. So I could move the two sticks to the free slots. I'm
             running another mprime test at the mo, so I'll give that a
        go later.

             Thanks,
             Leo

             On 17/05/15 12:06, Neil Stone wrote:

                 What happens if you swap the ram slots (assume you have
        more
                 than one
                 ram stick) ?

                 On 17 May 2015 12:02, "Leo" <li...@fractal.me.uk
        <mailto:li...@fractal.me.uk>
                 <mailto:li...@fractal.me.uk <mailto:li...@fractal.me.uk>>
                 <mailto:li...@fractal.me.uk
        <mailto:li...@fractal.me.uk> <mailto:li...@fractal.me.uk
        <mailto:li...@fractal.me.uk>>>> wrote:

                      Unfortunately none of my computers share the same
        RAM type
                 so I'd
                      have to purchase some more for that. So I thought
        I'd give this
                      memory mapping a go first.

                      Leo


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Rgds
RC

Robin Catling
Full Circle Podcast



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