I have an early '11 MacBook Pro 15", running Mavericks. Last week, I'd had enough of the slow running, pausing, crashing and, with the help of a "Genius" determined the problem was DRAM. The machine had 4 GB and was using 3.60-3.99 GB during normal usage. For me, normal usage is Mail, Safari, Word and PowerPoint. I'm a marketing consultant, so the computer doesn't have a lot of heavy lifting - just words. I upgraded to two 8 GB chips. The "About This Mac" shows Memory at 16 GB 1600 MHz DDR3. The computer is MUCH faster. Everything moves like it's new again. But the memory usage is climbing... fast! I installed the 16 GB yesterday. It showed usage at 3.85-4.10. By the end of the day, memory usage was at 5.5 GB. Today - right now, it's at 8.62 GB. Is this normal? Is my laptop going to max out by Friday and have me ordering 32 GB? Thanks!