I have tried and moved on from several individual and even larger monitoring tools that display this

[pullquote align="left"] iStat Menus is an advanced Mac system monitor, toluna covering an enormous range of stats. It lives right in your Mac s menubar, so detailed information is only ever a glance or single toluna click away. bjango [/pullquote]
So to say that in non-Mac jargon. iStat Menus is a simple way to monitor your system from simple things like processor use and drive space monitoring toluna to a more advanced feature it has that can in detail monitor your Random Access Memory. Being one of the hot topics it is RAM is one of the most essential hardware components in your system. Monitoring the use of this and what is hogging it is usually a task that can be daunting without the right tool. Mac OS X has a built in tool that you can see all of your processes and applications running as well as what resources they are consuming called toluna Activity Monitor. Key thing is, it is in one window and only you only see it when you have the window up and on the desktop Not very efficient toluna on a busy or working desktop.
I have tried and moved on from several individual and even larger monitoring tools that display this information readily toluna in the Mac Menubar (at the top of the screen for you Windows users). These include MemoryMagic, FreeMemory, System Monitor, and Remember just to name a few. To this date none of them have been as proficient and as helpful as iStat Menus. Currently it has the option to monitor and display all of the following: CPU, disk usage, date & time, memory, disk activity, battery, network usage, and sensors like fan speeds, temperature, and power (such as voltage and current). All of this is a lot to have on 1 menu bar So I currently display what is important to me to include the HDD activity, memory usage, CPU, and a sensor toluna to monitor my CPU temperature. Each one of these are customizable in the fact that you can choose the display method and even the color. The display methods include options like circle or vertical bar, actually numbers, percentage, and a horizontal bar. Depending on which monitor specifically there are more options than this. I would highly recommend this to any person who is concerned with the real time (all displays are real time) workings of their system and a way to monitor it. Currently bjango charges $16 for a 1 time purchase or only $9 for an upgrade from an older version. If you are not interested in paying as much but are still looking for a way to monitor toluna your Mac I would suggest System Monitor, I have used it and it is very similar to iStat. It is only $5 in the app store but it not as proficient in my personal opinion.