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April 29th, 2019 08:00
Extend memory of a dual CPU R730 equipped with 16*16GB modules
Hi,
we have a Dell R730 server equipped with two CPUs and 16*16GB RAM modules (in A1-A8 resp. B1-B8, so A9-A12 and B9-B12 are free). We’d like to extend the memory of the system by 64GB but use 32GB modules to occupy as less slots as possible. I’m not really sure this is possible. On one hand mixed configurations are supported according to the manual, on the other hand I know that configurations for both CPUs must be identical and I read here that “channel configuration must match” (although my user manual does not state this).
So my questions are:
- Will adding two 32GB modules work and how must the slots be configured (I don’t think moving the modules from A1 and B1 to A9 and B2 and putting the new ones to A1 and B1 or moving A1-A4 and B1-B4 to A9-A12 and B9-B12 and putting the new ones to A1 and B1 will work)?
- If this does not work, will adding four 32GB modules work and how must the slots be configured in this case?
- Where do I find more information on what “channel configuration must match” actually means?
Thanks for your support.
Michael.
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Dell-DylanJ
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April 29th, 2019 12:00
Channel configuration across processors needs to match, as in if you populate A1, B1 also needs to be populated. Based on what I see in the manual and with you looking to add 64GB, I would installed the new DIMMs into A1 and B1, then install the former A1 and B1 into A9 and B9. This will balance memory between the processors and the two channel 0s.
MichaelSch
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April 30th, 2019 02:00
Ok, so this means the following configuration with all modules being RDIMMs is supported:
A1, B1: 32GB
A2-A9, B2-B9: 16GB
In this case configuration for both CPUs is identical, but
It be great if this really works, I thought the modules in the sockets of a given colour (white in this case) had to be identical (or missing). This really saves us a lot of money since our sales contact and his technical expert told us, that we would have to buy 8 additional 32GB modules (so 256GB in total) instead of the 2 modules in the scenario sketched above.