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May 9th, 2024 16:56

PowerEdge T440 memory upgrade

Have a single CPU T440 with 96gb, 6x16gb. Looking to add more memory without adding another processor (so I don't violate server core licensing).

I see there are 10 DIMM slots allocated to Socket 1 which would provide a theoretical maximum of 160gb if all 10 slots are populated. However the service manual states to populate six slots for best performance. If I add two or four more DIMMs to get to 128gb or 160gb will there be a performance penalty for running in those memory configurations, or should I just stay at 96gb?

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3.7K Posts

May 10th, 2024 01:20

Hello thanks for choosing Dell and welcome to our community.

https://dell.to/4agYoZZ

 

We have to have infomration on your current memory specification such as the size (GB), and how many you have plugged in.

 

Respectfully, 

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May 10th, 2024 16:37

It is in the first sentence of my post I have Six (6) 16gb Modules for a total of 96gb currently.

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May 10th, 2024 16:49

With the 6 dimms installed it is all going across a single memory channel, when you add more it then goes to the second channel, which will drop performance. Now if the server isn't under too heavy of a load then this may be acceptable to you. 

 

 

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May 10th, 2024 18:16

Do you know how much of a performance drop it would be?

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May 10th, 2024 18:32

Not specifically, as there are too many variables. What I would suggest is testing it under both configurations and see what works best for your configuration.

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May 25th, 2024 00:23

Dell's manual has these info. 

  • Populate memory module sockets only if a processor is installed.
    • For single-processor systems, sockets A1 to A10 are available.
    • For dual-processor systems, sockets A1 to A10 and sockets B1 to B6 are available.
  • 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, 9, 10.

I think the peformance drop will be very small since you are also adding more memory to the system. Just add another 2x16GB or 4X16GB to CPU1 would be easy to test. 

Steve

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