Hi, I've got a macbook pro 13 inch early 2011 and i'm thinking of upgrading my ram. The store near my place only sells Mushkin DDR3 1333MHz PC3-10666. Will this ram be compatible with my macbook as the Mushkin ram is 10666 compared to the specification stated at apple's website which is PC3-10600 DDR3 1333 MHz type RAM? And i do not know what does the 10666 stands for. Would appreciate if someone could help