I got the specs of my Mac already. http://www.everymac.com/systems/app...nch-aluminum-mid-2011-thunderbolt-specs.html# RAM Type: PC3-10600 DDR3 Min. RAM Speed: 1333 MHz Supports 1333 MHz PC3-10600 DDR3 SO-DIMMs (204-pin) All I need to know is what exactly do I ask in stores for them to give me the correct RAM that I need? The computer stores in my country are super busy and not very organized so I need to tell them exactly what I'm looking for in order to avoid hassle. Thanks guys.