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Re: [PLUG] Another System w/ Instability
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Casey Bralla wrote:
> Believe it or not, I've got __another__ system with instability problems.
>
>
> I bought a new motherboard, RAM, & CPU for Christmas for a light-duty server.
> It was giving me some spontaneous reboots, so I've been running the memtest
> program. It's gotten a lot worse in the last few hours, but the results are a
> little strange to me. I was hoping someone here could help me understand.
>
> (No, Eric, this one runs Debian, so I haven't worn it out by compiling
> everything <grin>)
>
>
> There are 2 DIMM slits and I have a matched pair of two 2-GByte DDR2-800
> DIMMs. If I put either of the DIMMs in either slot, it runs fine. However,
> if I put BOTH DIMMs in, the system reboots about 10 seconds into the memtest
> routine.
>
> I put a pair of 1-GByte DDR-1066 DIMMs I had in another computer into this
> server (both slots) and it ran fine.
>
> I've also tried raising the voltage and slowing the access to DDR2-400 speeds,
> but nothing has helped.
>
>
> I'm concluding that the RAM is bad and will RMA it to New Egg. But I'm
> feeling a little uncomfortable about this. Might it be the motherboard
> that's bad? How can RAM be good when run as a single chip, but fail in
> pairs?
>
> BTW, when I run them in pairs, they are in interleaved mode, but obviously are
> not interleaved when run as a single DIMM.
>
I've had the exact problem with Kingston RAM I got on Ebay ( luckily
Kingston replaces it with no questions )
Separately each chip tested fine, but when in interleaved mode, only the
original pair worked, and the new pair I bought failed. Both pairs
were 2-2-2-5 timings (CL2) as well.
Luckily I spotted the problem by running memory tests at install, so the
system was never unstable.
Lee
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