I bought 4 sticks of 4GB ram and each stick gives 3 beeps at post, which means memory issue and I tried it in two separate Intel NUCs . What chances are higher, two bad NUCs or four bad sticks of ram. specs are right for ram, so it's compatible (DDR3L-1866 4GBx2 1.35v). Help
The other possibility is the SODIMMs use 1Mb or 2Mb technology, which is not supported. Again, we need full part numbers to determine if this is the case.
G.Skill Ripjaws Series 8GB (2 x 4GB) 204-PIn DDR3 SO-DIMM DDR3 1866 (PC3 14900) Laptop Memory Model F3-1866C11D-8GRSL
Series: Ripjaws Series
Capacity: 8GB (2 x 4GB)
Type: 204-Pin DDR3 SO-DIMM
Speed: DDR3 1866 (PC3 14900)
CAS Latency: 11
Multi-channel Kit: Dual Channel Kit
Heat Spreader: No
Features: High quality SO-DIMM memory 1.35V ultra low voltage for 3rd and 4th Gen Intel Core Processors
I have a suspicion, based upon the fact that the SODIMMs appear to have 16 DRAM parts each, that they utilize 1Mb/2Mb technology and thus are not supported by the NUC6CAYS/NUC6CAYH. Unfortunately, G.Skill's web site is nigh onto useless and I could not determine what is actually utilized. I can also say that the parts are not on the Intel compatibility list, but that doesn't necessarily mean that they are not compatible. My only suggestion is to try different memory and see what happens.