Quick question regarding RAM usage. First things first I have a late 2011 15in MBP 2.2ghz. Computer came with 4gb of ram (obviously) and while running Lion with iTunes, Firefox (with a couple tabs open), and mail the RAM usage when viewing it using Activity Monitor would usually not go above 3gb and occasionally page out when I had Photoshop open. Fast forward to today. I'm running Mountain Lion and upgraded to 8gb of RAM this afternoon. I'm sitting here with the same programs open and running (iTunes, FF, mail) and the computer says used RAM is at 4.15gb when it never really used to go above 3gb or so! Looking through Activity Monitor and seeing at what processes are running I come across kernal_task. From my understanding that's pretty much the OS doing it's thing and its taking up about 600mb but I don't remember it using up that much. Now my questions are: Now that the computer has more available RAM is it actually using more since it detects more available? Like, was it throttling back before because I didn't have enough? and How much memory is other people's kernal_task process taking up? Because looking at other Mac's in my house they don't run anywhere close. and How much RAM is being used up by others while doing normal computing? I have had many Mac's but this is the first one I have upgraded and I just think that it cruising along doing simple tasks but still taking up over 4gb of RAM is a little extreme. Thoughts?