>>I did some benchmarking at about 3 years ago at Sun Microsystems on Sun E450's with 4x480Mhz Ultra Sparc II CPU's and 4 GB memory with Oracle 8i and we able to get up 750 users. <<
Did you used some kind of standard benchmark transaction / scenario? There is everytime a problem by stating numbers without knowing what they represent.
Also I would like to add, while DB optimization is important, it should not be the base of a decision on wether to use hibernate or not. Just create some kind of prototypes imitating the main task of the real application. Implement it with diffrent persitence 'layers' and you will have a good answer to the question.
But you know, Hibernate is a lightweight persistence framework. This means, if there is a limitation in the concurrent servable user amount, the limitation is likely to be also present implementing the app using JDBC / DAO for instance.
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