Trouble Adding Memory

[Daniel Parish]

On 12/9/06, Jim Duda <jim at duda.tzo.com> wrote:
>
> I'm running Fedora Core 5.
>
> I have a plain vanilla 2.8Ghz P4 Intel motherboard with 4 DIMM slots.  I
> currently have 1 DIMM of 512M DDR 3200 memory.  I purchased a second
> DIMM of the same 3200 memory hoping to upgrade the memory.
>
> When I install the second DIMM, the BIOS properly recognizes it,
> however, FC5 won't boot properly.  The boot time takes forever.  The
> bootup is sitting in "Starting UDEV" for a very long time.
>
> I believe the new memory DIMM is okay, I can use either memory DIMM
> properly, however, attempting to use both causes a problem.
>
> I'm stumped as to what could possibly be wrong.
>
> I don't use the stock FC5 kernel, but instead have compiled my own
> 2.6.18-1 kernel.  I have the Memory Split option set to the default
> 3G/1G user/kernel split.
>
> I don't know if this is the correct list to ask this question.  Does
> anyone have any suggestions?
>
> Jim
>
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>

I had a similar problem recently.  I added memory and although the system
passed memtest in all possible DIMM configurations, it was unstable,
frequently hanging just as you describe.  On the occassions that it did
boot, the system showed errors when running the mprime torture test.  As it
turns out, the solution was to up the Vdimm voltage in the BIOS, but I did
not do this until I checked the memory manufacturer's website to verify
warrantied voltages, etc.  Probably worth a shot.

Daniel
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