[Dr_Cox1911]

Hm, I ordered my NUC and the RAM yesterday, but I bought the 4GB Crucial without the J at the end (so this one: CT51264BF160B). What´s the problem with the 4GB module without the J at the end?

https://communities.intel.com/message/213351 :

"The different between these parts is the density meaning
the number of black DRAM chips that make up the module. Part CT51264BF160B is a
low density version which will have 16 chips in total. Part CT51264BF160BJ
(note the J at the end) is high density meaning it will use only 8 DRAM chips
on the module.

The Intel D54250WYK will accept high density 4GB
modules only and this is why you are experiencing instability."

Thanks for the info, will try to contact my deliverer and switch the module. But I wonder if this is only true for the i5 version of the NUC or also for the i3.