Top and GKrellm/Torsmo

[Mirco Piccin]

Hi all.
I've seen this strange thing, monitoring my laptop resources.
If in the same moment I launch 'top' (shell) and 'torsmo' or 'gkrellm' (gui), those are the results:
- top
Mem: total 1555704K    used 1355420K   free 200284K
- gkrellm
Mem Total 1519MB - Mem Free  1133MB
- Torsmo
Ram Usage 387M/1,48G

So, considering that my laptop is just now running Xorg with gnome2, Firefox, Skype, Evince Document Viewer,VMWare Player with a Winzozz Machine with 400 MB RAM (work), i suppose that 'top' is right, and 'gkrellm' and 'torsmo' bad.
There's a way to understand why torsmo & gkrellm work bad? Is there same 'hidden' configuration?

Can U help me?
Thanks!