In article , SimonLW says...

You must have a lot of images open or do a lot of stitching of many smaller
files to need such a large amount of RAM.

The problem is that with typical panoramas even 2GB are sometimes not
enough, and the computer starts disk swapping.
For instance, with PTGUI a panorama with the layered output option with
ten 10MP images generates easily a 300MByte file. Open that in your
image processing software, with multiple undo levels and you quickly end
up filling up several GB of RAM
--

Alfred Molon
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Olympus 50X0, 7070, 8080, E300, E330, E400 and E500 forum at
http://tech.groups.yahoo.com/group/MyOlympus/
Olympus E330 resource - http://myolympus.org/E330/