Review on Apple MacBook Pro Memory Upgrade - 8GB Kit (2x4GB) DDR3-1600MHz PC3-12800 SODIMM by Radney Taala

This product has worked great and eliminated almost all of my beach balls. Installation was a bit tricky, just had to pull out the existing 4GB cards and put them in the same slots, but it has to be done right. I found b/4 buying guides online and when they arrived they also had the same basic instructions. Be sure to save all the screws and mark where the three long screws go back in.