Also check Plugins and Song settings

On this tabwindow u see which samples are used in the entire song.

You can see wheter a sample is in Mone or Stereo (M/S) and what its size is and how many times it is used in this song.

At the bottom, you see the total size of the samples (this is also the total memory consumptionfor all samples).

If you double-click on a sample in the list, all matching samples in the grid will be highlighted.

Take care : PC systems with big memory can load more samples than oterh PC systems.