While looking for a RAM upgrade, I found two offers which apparently only differ in the "S" suffix of the type, and in the price:

Both are from the same manufacturer (Kingston).

What does the "S" in "PC4-25600S" indicate? What is the actual difference between those two offers? And can I use either of these modules?

  • 1
    Does this answer your question? RAM Part Numbers - Meaning? Jan 24, 2023 at 10:40
  • @spikey_richie No, I did not find any explanation for the "S" in that linked question or in its answers (or maybe I overlooked that explanation).
    – oliver
    Jan 24, 2023 at 10:50
  • It could be some manufacturer saying it is a "SODIMM" module, or that it is "Single rank". The manufacturer or supplier should know for sure.
    – Mokubai
    Jan 24, 2023 at 11:05
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    @Cpt.Whale both modules OP listed say they are SO-DIMM, and only one has the "S" in the part number. So that is not the case here. Jan 25, 2023 at 1:19
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    Eh I kinda take that back. Affording to a DDR spec explainer site the S following the DDR speed code does mean it is a SO-DIMM. This means the information you are looking at is incorrect or inconsistent. Whatever source of information you are looking at where you got the text you quoted is not being correct or consistent. Jan 25, 2023 at 1:27


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