I've got an old early 2011 MBP which I would like to give to a family member. I want to keep a 2012 MBP as it has USB 3. The problem is that I have 8GB RAM in the 2011 MBP, and only 4GB in the 2011. I'd like to keep the 8GB for myself, but not sure if they're compatible. They're both DDR3, but the 2011 is PC3-10600 SO-DIMM 1333MHz and the 2012 is PC3-12800 DDR3L SO-DIMM 1600MHz. Now I've read the Intel chip will handle whatever is plugged into it, so while I can imagine the 2012 being able to use the 1333MHz, it's harder to imagine the older 2011 will be able to handle the 1600MHz. Does anybody know for sure?