> nowdays 2G per person doesn't cut it, 4G can be tight.
What are you doing?
I type this comment on a 512 MB machine. It runs a full Kubuntu (KDE not being known to be the most lightweight) and normal web browsing and text editing just work fine. LibreOffice brings the machine to swap a bit too much admittedly. Not that I would really be forced to use it, but IBM T40 is just a nice museum hardware and the small memory does not really disturb me.
On my work machines I have 4 GB and I hardly remember them swapping. Well, if I run 3 or more virtual machines I can feel memory getting short.
So for most classrooms 768 MB - 1 GB per user should be more than enough. Unless they compile Qt or do 3D modeling of course...
> If you have a dozen machines instead and one fails, it has far less impact
True for you and me, because we could start hacking around. However, not an option in many schools. There you pay extra for each administration job.