Dell PowerEdge - Advanced ECC vs Optimized for 8GB RAM

Question

We are buying new Dell R410 servers, and I'm trying to figure out the best RAM performance we can get.

Dell offers the following choices:

8GB Memory (8x1GB), 1333MHz Single Ranked UDIMMs for 2 Processors, Optimized
8GB Memory (4x2GB), 1333MHz Single Rank LV RDIMMs for 2 Processors, Advanced ECC
8GB Memory (4x2GB), 1333MHz Single Rank LV UDIMMs for 2 Processors, Advanced ECC
8GB Memory (8x1GB), 1333MHz Single Rank LV RDIMMs for Dual Processors, Optimized

From reading Dell help, and the following document: http://www.dell.com/downloads/global/products/pedge/en/server-poweredge-11g-white-paper.pdf

It seems the last configuration will the best performance one - is this correct? Also, is there any real difference between UDIMM and RDIMM for this kind of configuration?

Thanks!

Solution

So as per the comments above and some extra info, I think this is the fastest configuration:

• RDIMM (see page 8 'High Performance')
• 3 x 1Gb (or 3 x 2Gb) sticks per CPU (see page 8 'High Performance')

I realize these options won't provide exactly 8Gb RAM, but that amount appears to be an inefficient one for this processor type. Multiples of 3 seem to be the most appropriate.

Comments

[SyRenity]

Thanks, we would use 9GB, but it seems Dell does not allow such configuration.