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According to https://itigic.com/dimm-vs-so-dimm-characteristics-definition-and-differences/, for DDR3 module, dimm has 240 pins and so-dimm has 208 pins. What is the difference in this pin count? Number of power/ground pin difference or some other functional pin difference?

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    \$\begingroup\$ This is likely something you will have to research. The datasheets will tell you about the chips, but the difference is in the modules. I'd suggest searching for the spec/pinout of DIMM and SODIMM. \$\endgroup\$
    – rdtsc
    Commented Nov 12, 2021 at 14:16

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DDR3 DIMM module data sheet example (LINK):

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DDR3 SO-DIMM module data sheet example (LINK):

enter image description here

I tried comparing the module pins. odd number is front, even number if back. I checked only the first 26 pins.

enter image description here

From the picture I could see 240 pin module (DIMM) has more VSS pins.(VSS pin density) So as I expected it seems to provide more ground for signal integrity.

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  • \$\begingroup\$ I count 9 \$%V_{SS}\$ pins among the first 26 pins for the 240 pin DIMM, and 10 for the 204 pin. Next argument - ? \$\endgroup\$
    – greybeard
    Commented Sep 12, 2023 at 20:13

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