A second youth. Perfectly compatible with my macbook 7.1 (mid 2010), this is ideal for turning in Yosemite. I also replace my original hard drive for an SSD and, how quickly. I invested less than two hundred euros in total but it is worth it. Even for macbook 5 years, it is more efficient than modern PCs. For replacement, a maximum of 20 minutes for a beginner person and research tools. Finally, there are the 2x2 GO 60, then for 30 more, so put 2x4 GO.