Hackour Hello Can I add 4GB (1333Mhz) RAM memory to my MacBook Pro 4GB ram 1066Mhz (Support 1066Mhz)? Note: Two Slots : 1- 4GB 1066Mhz. 2- 4GB 1333Mhz. (new) Can I add Two Different Ram speed in the same Macbook? thx