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I really don't know, but in general I would guess that more threads are especially valuable on a multiuser machine. The sage notebook server has been undergoing some recent changes, and I expect it would make good use of the additional threads. So I would say it's worth the extra cost, especially with a view to do more things in the future, but of course it's not my money . . .

You could probably get a more expert answer on the sage developer list: sage-devel (you do have to request permission to join, but it usually takes less than 24 hours to go through).