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July 3rd, 2019 12:00
Memory Configuration- R620 1600 memory running at 1333
I upgraded my memory configuration from all 8gb 2R 1600 to a mix of 8 and 16gb 2R 1600 modules but it’s now running at 1333 speed. They are all dual rank modules.
The total memory shows 192gb which is correct (8 x 16gb and 8 x 8gb).
I populated slots a1-a4 and b1-b4 with 16gb modules and slots a5-a8 and b5-b8 with the 8gb modules.
I see one sample configuration for my server on Dell support with a mix of 16 and 8gb for a total of 160gb which I followed for my configuration except I put remaining 8 x 8gb modules in a5-a8 and b5-b8 for a total of 192gb. I put the 16gb modules in a1-a4 and b1-b4. See note from the sample 160gb configuration below:
NOTE: 16 GB DIMMs must be installed in slots numbered A1, A2, A3, A4, B1, B2, B3, and B4 and 8 GB DIMMs must be installed in slots A5, A6, B5, and B6.
Question: Am I correct in assuming that putting the extra 4 8gb modules in a7-a8 and b7-b8 is correct?
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Daniel My
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July 3rd, 2019 15:00
Hello
Your configuration sounds correct.
16GB in 1-4
8GB in 5-8
The memory should be able to operate at 1600 in that configuration. If there is any memory populated in slots 9-12 then the max speed is 1333. Also, all memory will operate at the speed of the slowest module. I suggest that you double check that all memory is dual or single rank and 1600. Also, make sure the BIOS is updated, memory support is something that is commonly updated with the BIOS.
Also, I'm assuming these are registered/buffered modules since I doubt UDIMMs are available in 16GB sizes. If they are UDIMMs, UDIMMs operate at a max of 1333 if there is memory in slots 5-8. Memory speed is covered on page 40 and 41 in the manual.
http://www.dell.com/support/
Thanks