upgrading memory for R640 with only 1 CPU

Question

I have R640 server with only 1 CPU 1 x Intel Gold 6258R Processor I have 6 x 32GB I would like to upgrade my RAM to 24 x 32GB is it possible? and also what to do to upgrade RAM to 1024

DELL-Shine K · Accepted Answer

Yes. Both processor on the server need to be exactly same model

DELL-Shine K · Accepted Answer

No. You can not mix RDIMM and LRDIMM on same server. Below link have details on same

https://www.dell.com/support/manuals/en-us/poweredge-r640/per640_ism_pub/general-memory-module-installation-guidelines?guid=guid-acbc0f13-dedb-492b-a0b0-18303ded565a&lang=en-us

DELL-Young E · Accepted Answer

Hi, yes you can.

DELL-Shine K · Answer

With single CPU you can only use 12 DIMM slots (A1 to A12). Other 12 DIMM slots(B1 to B12) will be active only when CPU 2 is installed. You can find more details on this from below link.

https://www.dell.com/support/manuals/en-ca/poweredge-r640/per640_ism_pub/system-memory-guidelines?guid=guid-5a0bcfc5-3e0c-41ee-9ac7-efaadd3703dc&lang=en-us

DELL-Shine K · Answer

R640 support 64GB RDIMM. With 64GB RDIMM you can go upto 768GB with single processor. If you need to get 1024GB memory then you can either use eight 128GB LR DIMM or upgrade to dual processor.

maherkhalil · Answer

if I will upgrade the processor, the second processor must be the same as the installed one? or I can select another model?

maherkhalil · Answer

Thank you

maherkhalil · Answer

Can I mix RAM for the same processor as mentioned below? 6 x 32 GB RDIMM => already existing 6 X 128 GB LR DIMM => i will buy and install

DELL-Young E · Answer

Hi, maherkhalil Shine's correct.     RDIMMs and LRDIMMs must not be mixed. NVDIMMs and LRDIMMs must not be mixed. NVDIMMs and RDIMMs can be mixed.     https://dell.to/3qOEMra

maherkhalil · Answer

Hello

Now, I need more RAM. so, I decided to remove the RDIMM RAM and replace with LR DIMM to get more RAM

since LR DIMM is very expensive, I plan to by 3 x 128 GB of LR DIMM to replace 6 x 32 GB of RDIMM.

Is it possible or I have to buy 6 numbers of LR DIMM?

DELL-Young E · Answer

Hi, please see here

https://dell.to/3G657rj

"Mixing of more than two memory module capacities in one system is not supported.
Unbalanced memory configurations will result in a performance loss so always populate memory channels identically with identical DIMMs for best performance.
Populate six identical memory modules per processor (one DIMM per channel) at a time to maximize performance.
DIMM population update for Performance Optimized mode with quantity of 4 and 8 DIMMs per processor.
When the DIMM quantity is 4 per processor, the population is slot 1, 2, 4, 5.
When the DIMM quantity is 8 per processor, the population is slot 1, 2, 4, 5, 7, 8, 10, 11."

maherkhalil · Answer

Hello I will not mix RDIMM with LRDIMM I will remove 6x 32 GB RDIMM completely and replace them with 4 x 128 GB LRDIMM for now Is it possible without problems?

DELL-Chris H · Answer

As stated previously, it isn't recommended to mix, you can try but it likely will not be optimal, or supported.

maherkhalil · Answer

Hello I said I will not mix RDIMM with LRDIMM I will remove all RDIMM and install 4 x LRDIMM Is it ok?

maherkhalil · Answer

Thank you

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upgrading memory for R640 with only 1 CPU

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