Memory configuration for C30

Hi All!
I was hoping someone would be able to help me.
We are about to buy new machines which will mostly be used for CFD simulations using Fire Dynamics Simulator (FDS) which is run using MPICH.
We are likely to get Lenovo C30 systems with 2 x Xeon E5-2650 v2's, this is the IT departments choice. I'm an engineer who will be using the system to run CFD models. However i have owned several Thinkpads in the past and found them great machines.
I understand that the CPU is a key component that affects simulation speeds however memory also has a huge impact.
Am I right in thinking that it would be better to provide 8 x 4 GB of memory (The CPUs have 4 memory channels each) rather than 2 x 16 GB? Most of the CFD models that are run will use from 2GB to 8GB of memory, with more than 20GB being a very rare event.
I have spoken to Lenovo online and i got a repsonse that using less DIMM slots is actually quicker! This goes against my own knowledge of how it works and the other research i come accross.
The C30 has 8 DIMM slots. I guess the general question is, to gain maximum memory speed you should populate all 8 DIMM slots with identical RAM? Anything less will not give the maximum memory speed.
As CFD is very memory intensive this will have a knockon effect to CFD performance (run times). Is anyone able to suggest if the extra cost involved in 8x4GB will give a noticeable performance boost over using 2x16GB?
I would really appreciate any help
Regards,
Matt
Online conversation with Lenovo:
Please wait while we connect you with a Lenovo Chat Representative.
Connected to Harathi
Harathi : Thank you for contacting Lenovo Sales Chat. My name is Harathi and my Rep ID is 2900711681. Happy to help you today. Hello, may I know your name please?
You : Hi, my name is Matt
You : I have a quite technical question
Harathi : I will try to answer Matt
Harathi : We have dedicated technical team for this
You : We are about to buy some new machines which will mostly be used for Computational Fluid Dynamics simulations using the Fire Dynamics Simulator program. The simulations are very memory intensive and are normally run using MPICH. We are likely getting Lenovo C30 systems with 2 x Xeon E5-2650 v2's. I understand each Xeon processor has 4 memory channels and there are therefore 8 memory channels in total. Am I right in thinking that it would be better (higher performance) to provide 8 x 4 GB of memory rather than 2 x 16 GB? The key issue I see is that if you only use 2 of the DIMM slots then you are only maximising two of the memory channels. In that case the memory transfer will be limited. If you use all 8 DIMM slots you will use all the memory channels and maximise throughput. Therefore 8 x 4GB will have more transfer bandwidth than 2 x 16GB. I also realise that 8 x 4GB will be more expensive and will limit upgrade options in the future.
You : Sorry, this tool doesn't like paragraphs.
Harathi : Let me read
Harathi : Have you customized C30?
You : That is the question, when we buy the new machines will customising it with 8 x 4GB RAM modules give a performance boost compared to 2 x 16GB?
Harathi : Let me check that for you.
Harathi : Please give me few minutes
You : Ok, no problem, thanks.
Harathi : Thank you
Harathi : Thank you for your time. 2 x 16GB will give better performance
Harathi : May I know if you are customizing it now to order?
You : Yes
Harathi : Okay
Harathi : I will be online while you place the order
You : Why will 2 x 16GB give better performance? Can you explain a little?
You : Why would not using all the 8 memory channels give better performance?
Harathi : I will explain you
Harathi : System will take some of the memory capacity from every RAM stick
Harathi : This is just an approximate figure. When a 8GB RAM is added, the actual RAM you get will be 7.5GB or so, that way you'll loose more capacity of the RAM when you add more sticks.
You : Ok, I can understand that. So 2x16GB will give you more total memory than 8x4GB.
You : However, capacity is not the main concern. I am concerned with speed. I want the fastest memory to CPU transfer available.
Matt, less # of memory sticks will give you more speed
You : Ok, that's interesting. Thanks.
Harathi : You are welcome
Moderator note;full name of Lenovo employee / associate edited in accordance with the Forum Rules

By adding more DIMM, should you benefit from higher transfer rate of dual, triple or quad-channel?
I rememberred reading somewhere that dual-channel (2x DIMM / CPU) will give you a big jump from single DIMM, while triple and quad config are only a tiny bit faster than 'dual'.
The above information may need a confirmation from technician or more reseach regarding specific CPU though.
If it were me, I might go with 2x8GB / CPU leaving room for future upgrade while complying with dual-channel config.

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