I I am going from 4GB memory to 8 GB in a MacBook Pro. The new memory I purchased is listed as the correct memory for my MacBook.
My question is tho old memory states that it is 1333 MHz DDR3, the new 1066 MHZ DDR3.
To me, the uneducated computer novice, it would the lower MHz would indicate slower speed.
Does anyone know?

Last edited by jazzsax; 06/15/19 12:03 PM.