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Testing more installed memory than CPU supports

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  • Testing more installed memory than CPU supports

    Hi
    I'm pretty sure I know the answer to this but it would be good to test my understanding .
    I mistakenly installed 12GB RAM on a board fitted with a Celeron J4025 CPU. This CPU only supports 8GB.
    The UEFI/BIOS reports 12GB RAM installed as does the OS & Memtest86 and the machine boots normally. I ran Memtest86 overnight with the default tests and got a 'pass'.
    I presume however that as the CPU can't actually address all 12GB, Memtest86 is testing some of the RAM twice - is this credible or does Memtest86 test for 'folded over' (for want of the proper technical term!) memory addressing?
    I suppose it could by writing different values to blocks of memory then reading it back, but the use case is flimsy as who installs more memory than the hardware supports ?
    Many thanks in anticipation
    Cheers, Mike

  • #2
    I think the Intel specs are wrong.
    Comments in the Intel support forum state that more than 8GB is supported if the motherboards support it. Plus you seem to have just proved that it works (there is no such thing as folded over memory addressing).

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