If I am posting this in the wrong forum, please let me know. I have spent the last few days researching what I'm about to ask, and have yet to find a clear answer to my question: what is going on with my RAM/pages/swap? I have a new Macbook Pro 13-inch w/8GB RAM, 256 SSD, etc. It's the latest revision, and runs OS X 10.10. I just restarted. I am running the following: Safari with 6 tabs (including this one!) Reminders Evernote Notes Messages Pages (with a 2 page text document) Calendar Noteability Steam (no games, just the client) Activity Monitor The following apps start with my computer, and run in the menu bar: Evernote Display Menu Dropbox (not syncing anything, rarely does) f.lux iStat menus (CPU, RAM, HD, Network, Clock, Battery) Activity Monitor shows: Memory pressure around 15%. Physical mem: 8.00GB Mem used: 7.98GB Swap used: 0bytes App mem: 5.32GB File cache: 1.51GB Wired mem: 1.08GB Compressed: 0bytes iStats shows 431,731 Page Ins, 29 Page Outs I think I have a good handle on how OS X works with memory, so I know that seeing "Memory Used" at 7.89 is actually a good thing. What I don't understand is how I am getting Page Outs on this system. Why do I have Page Outs when I have 1.5GB of RAM in file cache? Why am I getting Page Outs (which as I understand means I may be running out of RAM) when Memory Pressure is at 15%? To make things even more confusing, I sometimes see Swap Used as >0bytes AND Page Outs AND low memory pressure. Since starting this post a few minutes ago, my Memory Pressure has held at 13%, yet my Page Outs have increased to 47. And I'll I'm doing is typing this post.