Re: Problems with AMD64 and 8 GB RAM?

From: Steve Kargl (sgk_at_troutmask.apl.washington.edu)
Date: 03/31/05

  • Next message: Scott Long: "Re: Problems with AMD64 and 8 GB RAM?" 
    Date: Wed, 30 Mar 2005 14:57:15 -0800
To: "Greg 'groggy' Lehey" <grog@FreeBSD.org>

    On Thu, Mar 31, 2005 at 08:14:45AM +0930, Greg 'groggy' Lehey wrote:
    > On Wednesday, 30 March 2005 at 14:35:46 -0800, Steve Kargl wrote:
    > > On Thu, Mar 31, 2005 at 07:54:39AM +0930, Greg 'groggy' Lehey wrote:
    > >> None of these problems occur when I use 4 GB memory. About the only
    > >> strangeness, which seems to come from the BIOS, is that it recognizes
    > >> only 3.5 GB. If I put all DIMMS in, it recognizes the full 8 GB
    > >> memory.
    > >>
    > >> I realize that this isn't enough to diagnose the problem. The reason
    > >> for this message now is to ask:
    > >>
    > >> 3. Where should I look next?
    > >
    > > Have you run sysutils/memtest86 with the 8 GB?
    >
    > Heh. Difficult when the system doesn't run.

    That's what happens when 1 of 8 (1 of 4?) DIMM is bad :-)

    > > I had 4 bad out of 12 tested where the DIMMs were Crucial PC2700 2GB
    > > Reg. ECC DIMMs.
    >
    > OK, this makes sense. It might also explain why the 4 GB
    > configuration only recognizes 3.5 GB.

    Search amd64 mailing list. The missing memory is reserved for
    something which escapes me at the moment. Similar to the
    infamous ISA memory hole. 

    -- 
Steve
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  • Next message: Scott Long: "Re: Problems with AMD64 and 8 GB RAM?"