Jorge, we run a high-volume Moodle install on a cluster here in NZ. I have posted a lot of config tuning hints in this forum. Read old threads and/or search for the keywords "maxclients", "pconnect" "max_connections", "accelerator", etc.
Right now, the bottlenecks are usually memory usage and disk access. Get more RAM (and learn to tune Apache/PHP's memory usage), and get faster disks (and tune your disk usage).
There's some more info on how we run our cluster in these slides, too: http://catalyst.net.nz/moodle/enterprise/ .
(Edit: también hablamos en castellano ;)
Hardware and performance
I need to know, what is the correct server that might use the institution
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