I have python (1.4) on a xubuntu 12.04 machine (fresh install). The machine has 6GB ram and an intel i3 processor (I don't remember the exact model). On a previous install of Ubuntu (13.04) I had no trouble viewing files of that size, but now I can't. I get the "standard" EEK! pymol just run out of memory etc.
To my knowledge, 6GB of ram should be sufficient for such task, isn't that so?