Does Pangolin Performance (model 9 is the latest) take DIMM or SODIMM for memory? It's a laptop, so it should take SODIMM, but in the "configure and buy" selection, the thumbnail of memory stick they showed was the longer DIMM, used in desktop computers.
The other details, like 204 pin, 1600mHz, are specified, but not that it's SODIMM. Normally that would be a no brainer, but I just wanted to make sure before telling people to give me inexpensive RAM memory as gifts to accompany my laptop purchase.
https://www.system76.com/laptops/model/panp9 is the location of the confusion. Notice how in the specs it also doesn't say DIMM or SO-DIMM.