I bought this kit two strips of 8 GB each to replace the original RAM with a 13-inch MacBook Pro early 2011. Contrary to what Apple, this machine not only supports 16 GB of memory, but also a frequency of 1600 MHz. This last point is interesting because the graphics card uses shared memory. As I read on various sites, Komputerbay kit works perfectly on Mac to 1600 MHz. I have had to deplore any instability. The balance is totally positive, considering the reasonable price. Finally, the delivery was very fast and good packaging.