OK, so here goes... The Mrs. and I each have a MacBook: Mine- late 2011 MBP 13", 2.4 i5, 16 GB RAM, Lion 10.8.2. Hers- mid-2010 MB 13", 2.4 C2D, 2GB RAM, Lion 10.8.2 I recently upgraded my own RAM in the MBP, first from 4GB to 8GB, then a little later up to 16GB. I'd like to use the now-redundant RAM in the Mrs.' MB, but have little idea how to determine if it will work. Option 1 is to just install it and hope for the best. Option 2 is to ask here to see how I'd determine if I can use all this extra RAM. Input, anyone?