I just bought a 2012 MBP 15 Base and it comes with 4GB 1600 MHz memory. I put M4 256GB SSD to boost the speed immediately but think I need to upgrade memory (I already had the M4 ordered few weeks ago). I run Windows 7 via Parallels and usually have multiple windows of Excel spreadsheets (Office for Mac), Word documents, PDF's, and browsers. I rarely use graphics related programs other than Seashore. By the way, I had to assign only 1GB to the W7 due to having only 4GB total system memory. System Monitor under my activity monitor shows 4.15GB Page ins, 2.33 GB Page outs, and 2.16GB of Swap used (I'm not sure when it resets but I rebooted the system yesterday afternoon). Would I benefit from upgraded memory? I'm thinking 8GB would be more than sufficient but also wonder if I need to use 1600 MHz memory versus cheaper 1333 MHz memory. Also, would I ever need 16GB memory in the next 2~3 years?