Compatibility
I just want to know the difference between DDR3 and DDR3 SDRAM. I would like to put this in my wife's Macbook Pro. It's a late 2011 model which currently has 4 GB of 1333 MHz DDR3 SDRAM (PC3-10600) installed in pairs (two 2 GB modules). If I remember right, I wont be able to mix this card and one of the old cards as they will only operate at the 1333MHz speed so it will be running solo, since it is a x64 system I may buy two for it anyways though. It has been many years since I have actually upgraded the ram so I don't remember all of the things I should.