I have a mid-2007 white MacBook (2.16GHz) and have decided to upgrade its memory from the 1GB it currently has. From what I've found, is that this model will operate on a maximum of 3GB ram. Though price isn't really the factor, note that there is about a $25 difference between 2GB and 4GB. Since this is the case, will I be better off upgrading to 2GB (2x1GB), or upgrading to 4GB (2x2GB), even with the knowledge that it will only support 3GB total? Will this make a difference, and would the computer operate better or worse while not utilizing all the RAM physically available (in the case of a 4GB upgrade)?