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    It is correct, it is just that you are not interpreting the colors correctly, as Sukminder tried to point out. The reason that you have all those bars is because the number of bars represents the total of "used" (green) + "buffers" (blue) + "cache" (orange) whereas the metric at the end is just "used"/total. The "used" category may be confusing in relation to buffers and cache if you don't understand the difference between these things and why they are considered important -- in which case, just ask. Commented Mar 8, 2013 at 22:54
  • I was under the mistaken impression that all the "used" memory was the bars, and that it just changed color as it got higher, like a VU meter on a stereo. : \ My mistake! Commented Mar 8, 2013 at 22:58