Hi guys - non-techie here. This summer - with your excellent assistance - I swapped the HDD for a SSD on my 2008 Macbook and have been raving about the improvement. Now my colleague wants me to fix up her Late 2011 MBP. I feel confident in my recommendation of the SSD (told her to get the same Crucial BX100 I got), but I don't know from what on the memory. I know she needs 8GB in a 2X4GB pair but then all the numbers confuse me. Her current set up is 4GB 1333 MHz DDR3. Can someone smart point me in the right direction or help me understand what I'm looking at, numbers-wise, and what I need? Thanks. Sam.