Upgrading memory 2850 to max

[Kurt_Olsson at Dell.com]

"Reading the docs, it seems that I need 4 modules of 4GB, and they have to be single ranked (1R)."

Not exactly.

The Lindenhurst chipset only supports 4 Ranks per channel, so 2x2R for channel A and 2x2R for channel B is allowable.

Another way to say this is that the chipset will only allow 8 ranks total, which may not be intuitively seen because there are 6 DIMM slots. You have 3 DIMMs per channel with this server, DIMMs on channel A are connected to the lower bits of the memory data bus and channel B to the upper bits.

My point is that the dual ranked DIMMs should be cheaper than single ranked, due to the memory densities required.  

-----Original Message-----
From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Tino Schwarze
Sent: Tuesday, January 20, 2009 8:15 AM
To: linux-poweredge-Lists
Subject: Re: Upgrading memory 2850 to max

Hi Stijn,

On Tue, Jan 20, 2009 at 03:02:48PM +0100, Stijn van der Ree wrote:

> I have a question that is not strictly Linux related, but I do run Linux on
> our Dell's, and I know there's a lot of hardware knowledge on this list.
> 
> I'm planning to upgrade the memory of two of our 2850's to the maximum of
> 16GB. Reading the docs, it seems that I need 4 modules of 4GB, and they have
> to be single ranked (1R).
> 
> http://support.dell.com/support/edocs/systems/pe2850/en/it/t1393c60.htm#wp1172300
> 
> I like buying Crucial memory, and found these modules:

Get a quote from your Dell sales person first. We recently bought a lot
of memory (16 GB each for two servers, a 1950 and a 2950) and it was
really cheap (like 500 Euro for 16 GB!). When I saw that price, I didn't
even consider looking for other memory suppliers.

Maybe the 2850 takes slightly different kinds of memory modules...

HTH,

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

www.lichtkreis-chemnitz.de
www.craniosacralzentrum.de

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