This NEMIX RAM memory upgrade is certified Apple Memory for Apple iMac 27-inch Late 2015 w/Retina 5K display.
Model ID: iMac17, 1 ( 3.2GH z i5, 3.3GH z i5, 4.0GH z i7). MK482LL/A MK472LL/A MK462LL/A.
Product Specs: 8GB 204-pin DDR3 SO-DIMM, DDR3L-1866Mhz PC3L-14900. CL11, 1.35V Non-ECC Dual Rank. RoHS compliant and Jedec Standard Certified. NEMIX RAM Meets and/or Exceeds Apple/Intel Specifications.