Problems with AMD64 and 8 GB RAM? (solved)
Greg 'groggy' Lehey
grog at FreeBSD.org
Mon Apr 4 17:39:16 PDT 2005
On Thursday, 31 March 2005 at 10:59:02 -0800, David O'Brien wrote:
> 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.
This looks like it's the issue.
> 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
Done that. It was quite revealing. This particular motherboard and
BIOS supply either "ECC off" or "ECC in chip kill mode". Mine was
off, and I got many errors. With 4 GB (any two chips) and chip kill
mode enabled, I ran memtest86+ for about 18 hours and got about 1 ECC
error per second. With 8 GB, with or without chip kill, neither
FreeBSD, memtest86+ nor Linux run reliably: memtest86+ spontaneously
reboots every 5 minutes or so.
I borrowed this memory to test the motherboard, and it's going back
this week anyway. I now have my own memory :-(all 1 GB of it), and it
tests perfectly. The memory I had the trouble with works perfectly in
the machine for which it was purchased, so it does indeed look like an
electrical loading problem.
The moral of the story is, I suppose, "don't buy the MSI K8T
Master2-FAR". I was warned about the motherboard before I bought it,
but at the time it was the only game in town. Now I know of other
places with (hopefully) better boards.
See complete headers for address and phone numbers.
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