I recently purchased a new MBP 13" i5 and am considering upgrading the RAM to 8gb. I have done a little searching around the forum here, and people are talking about different speeds that may work on my model MPB or may not work, and I wasn't able to find a definite answer. Can those of you who have a 2011 MBP 13' and have upgraded it to 8gb of RAM provide me with a link to what you bought and let me know how it is running for you? Also, the reason for the upgrade is to hopefully get my windows installation in parallels working a bit faster. How big of a difference in overall performance will I notice by upgrading to 8gb of RAM? Thanks for the help.