Jonathan Gilpin wrote:
I've run memtest (memtest86.com) kindly provided by Don and it passed all
the tests. I've installed installed a kernel module to test for memory
errors and found that again no memory errors are found... So this means it's
either a problem with the CPU's or a geniune bug in the kernel. (bugger!)

No, that's unfortunately not what it means. If a memory test fails you can draw the conclusion that you have bad memory, but this doesn't work the other way round. If a memory test passes there is still a possibility that a memory chip is the culprit since memory test software cannot find all errors.


Also, there is the chip set on the mainboard that coordinates bus access etc. for the two CPUs. Mainboard and chip set developers are known to make errors, too. In this case you would have to swap the entire mainboard, possible with one from a different manufacturer. I can tell you from my own experience that it is really hard to find reliable PC hardware these days, in light of ever shorter and faster product release cycles.

   Uwe
--
Uwe Doering         |  EscapeBox - Managed On-Demand UNIX Servers
[EMAIL PROTECTED]  |  http://www.escapebox.net

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