Re: Problems with AMD64 and 8 GB RAM?

From: David O'Brien (obrien_at_FreeBSD.org)
Date: 03/31/05

  • Next message: Don Bowman: "RE: Adaptec 3210S, 4.9-STABLE, corruption when disk fails" 
    Date: Thu, 31 Mar 2005 10:59:02 -0800
To: "Greg 'groggy' Lehey" <grog@FreeBSD.org>

    On Thu, Mar 31, 2005 at 11:24:29AM +0930, Greg 'groggy' Lehey wrote:
    > On Thursday, 31 March 2005 at 10:32:33 +0930, Daniel O'Connor wrote:
    > > On Thu, 31 Mar 2005 08:14, Greg 'groggy' Lehey wrote:
    > >>> Have you run sysutils/memtest86 with the 8 GB?
    > >>
    > >> Heh. Difficult when the system doesn't run.
    > >
    > > You could try http://www.memtest86.com although that doesn't do >4Gb
    > :(
    >
    > I'm pretty sure it's not the memory. I've tried each pair
    > individually, and it's only when they're both in there together that
    > it's a problem. And yes, I've tried them in each pair of slots.

    You have a dual-channel memory controller. If you insert one DIMM you
    perform 64-bit data accesses. If you install DIMM's in pairs (making
    sure you're using the right "paired" sockets), you perform 128-bit data
    accesses. Thus your access pattern is different between these two
    situations. I'm highly suspious that you can us 4x2GB DIMM's with out
    knowing the exact part number. Don't forget 2GB DIMM's are
    double-stacked and thus look like double the electrical bus loads. The
    same is true for older 1GB DIMM's.

    Install all the memory you would like to use into your motherboard,
    download memtest86+ version 1.40 from http://www.memtest.org, dd to
    floppy or burn the ISO, and report back your findings from running it.

    Also what version of the BIOS are you using? 

    -- 
-- David  (obrien@FreeBSD.org)
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  • Next message: Don Bowman: "RE: Adaptec 3210S, 4.9-STABLE, corruption when disk fails"

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