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" <[email protected]
<mailto:[email protected]>> 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" <[email protected]
        <mailto:[email protected]>
        <mailto:[email protected] <mailto:[email protected]>>> 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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