These are 2Gb density and thus should not be used. You need to swap for 4Gb density SODIMMs.
Thank you for your reply.
On the ram's product page i linked to in the original post up here 'density' is not mentioned at all in the technical specs. How can I know that the next memory I purchase has the correct density?
* Update: I found compatibility checkers on SODIMM manufacturer's websites and ordered a 4GB module that's supposed to be compatible with my model NUC. Should have done this before purchasing the NUC. The lesson: Do not trust amazon to recommend you the right ram for your NUC!