From owner-freebsd-hardware@FreeBSD.ORG  Thu Jul 19 15:23:08 2012
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From: Erich Dollansky <erichfreebsdlist@ovitrap.com>
To: Andy Young <ayoung@mosaicarchive.com>
Date: Thu, 19 Jul 2012 22:25:24 +0700
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Cc: freebsd-hardware@freebsd.org
Subject: Re: Server memory problems
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Hi,

On Thursday 19 July 2012 22:08:23 Andy Young wrote:
> 
> > because the machine needs more electricity with the extra modules. If it
> is at the limits without, it could go behind > with the additional modules
> installed.
> 
> Interesting. The chassis has dual 900W power supplies. Apart from simply
> replacing them, I am not sure how I can verify whether the power supply is
> the issue.

the next question is if the machine can run with only one. If it is so, then remove one when you have the failing configuration. If it still fails, remove the other one an bring the first one back.
> 
> > You did not answer the question regarding ECC.
> 
> The memory modules I added are listed on Newegg as Kingston 8 GB 240-Pin
> DDRS SDRAM ECC Registered DDR3 1333 Server Memory. So yes they have ECC.
> 
> > Did you mix the modules?
> 
> Yes. There is a mix of modules in there. The original 32 GB of memory that
> I put in to begin with are not the exact same module. They are Hynix 8GB
> PC3-10600 DDR3-1333MHz ECC Registered CL9 240-Pin DIMM Dual that came from

This must work as both are registered and ECC. In addition you should have a BIOS option like 'scrup' the RAM when booting. This takes some time but might shows already the problem.

Erich