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I was just using a DDR3 RAM module as a feeler gauge and it fit the gap perfectly.

However, then I tried to find out how thick it actually is and I couldn't find any specs.

I'm assuming it's standard 1.6mm FR-4, but there must be a specification out there, right?

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  • \$\begingroup\$ Find a datasheet for the socket and you will probably find the answer. \$\endgroup\$
    – Transistor
    Jan 29, 2019 at 21:39
  • \$\begingroup\$ Is mechanical design off-topic? There is a "mechanical" tag and there are questions like this one. \$\endgroup\$
    – AndreKR
    Jan 29, 2019 at 22:37

2 Answers 2

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A simple google search gives you the answer you are looking for. the PCB is 1.27mm thick. For the other mechanical dimensions see here at page 11 DDR3 DIMM Dimensions.

drawing

Please note that not all manufacturers are equal, but in general these dimensions match the standard.

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  • \$\begingroup\$ Nice find! I added a screenshot. \$\endgroup\$
    – AndreKR
    Jan 29, 2019 at 22:00
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JEDEC says:

For DDR4 LP RDIMM reference designs with SDRAMs in a single row, a maximum package size of 11.0 mm nominal width and 13.0 mm nominal height will be used. Individual reference designs may have different requirement

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  • \$\begingroup\$ That seems unrelated to the thickness of the PCB. \$\endgroup\$
    – AndreKR
    Jan 29, 2019 at 21:58
  • \$\begingroup\$ This seems to be talking about the individual SDRAM chip packages on the module. \$\endgroup\$
    – Hearth
    Jan 29, 2019 at 22:09

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