So I have this Late 2011 Macbook Pro 13' Model with i5 Processor. This one came with 4 GB RAM onboard and it looks like simple things like two users logging in at the same time and running different browsers (Chrome and Safari) bogs this machine down. I checked the Activity Monitor and the Page Outs are a lot constantly. Just with two users simultaneous logged in (only with one actively using the mac) and just running things like browsers and iPhoto and iTunes! But obvious - I need more memory. I checked out OWC's memory and there are two options for me, 1. Buy 4x2 = 8 GB (I will have to replace 2x2 = 4GB RAM that the mac already has) = Making total RAM 8 GB 2. Buy 8 GB Single slot and fill the other slot with 2 GB RAM module that I already have leftover. = Making total RAM 10 GB (and future upgrade option of 16 GB) So - which one is recommended? 1 or 2 ?