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There are 3 servers R430 (S1, S2, S3). All of them have 2 procesors and 8*8GB of ram in slots A1-A4 and B1-B4.

There is a need of extending memory.

I've read dell recomendations (http://www.dell.com/support/article/us/en/19/SLN296980#SampleConfig) and i see 2 possibilites:

  1. buy 8*16GB ram, put it to S1, and memory from S1 put into S2 and S3.
  2. buy 3*8GB ram, and add it to S1..S3.

In first case - there will be 128GB ram in S1, and 96GB ram in S2 and S3. In second - there will be on every machine 96GB ram.

Does anybody knows what difference of speed can i expect in 1 and 2 scenario in comparsion to current situation? I expect that situation where memory is not equally mounted between processors will reduce performance. But - how much drop of performance can i expect in both cases? 1%? 10%? Where will be smaller?

undefine
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    possible duplicate of [Can you help me with my capacity planning?](http://serverfault.com/questions/384686/can-you-help-me-with-my-capacity-planning) – Gene Aug 31 '15 at 16:37
  • i don't think. I don't look for capacity planing - i'm looking for information how big is difference in performance between different configuration. – undefine Aug 31 '15 at 21:22
  • Unless someone has the exact same hardware as you and is willing to perform tests for you, you'll need to test it yourself. – Gene Aug 31 '15 at 21:28
  • not exactly the same hardware - i think less specific - how is performance difference when are used different different modules. Is that 1%? 5%? Or 30%? the same problem is on all servers which allow now equally puting memory to slots. – undefine Sep 01 '15 at 08:14

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