I have a 2.6/512/8 rMBP. I boot fresh and don't open any programs, except Aperture. With Aperture open, Activity Monitor shows a spike in my RAM usage, but within a couple minutes I'm getting page outs. I'm not even using Aperture, just left it open. Does Aperture really use that much memory? Why is so much of the graph blue (Inactive)? Now I feel like I should have gotten 16GB RAM.