Runs not stable in the iMac 27 "Late 2013 Had! Months problems with this memory and sporadic crashes especially for videos. I might try to eliminate all possible sources of error and blamed the problems of the SW, since the memory checks were all successful and absolutely no problems with the Original configuration occurred. More recently I have found that the Mac just with the 1.35 V, so DDR3L variant of memory is stable. If these users yet without memory problems in the iMac 27 "Late 2013 running with no problems, the accident and probably due to the scattering of the bolt or Mac HW. Unfortunately, in the Apple specifications of DDR3L is nothing to read. Thus, Kingston can not be attributed the problems. Because here nothing to read was only 3 stars.