Two elgg installations using the same database?

I don't know if that's possible with elgg.

Is it possible to have two elgg sites, each one in a different server, using the same database installed in another server? Or is this something not possible til elgg 2.0?

Background story:

I'm using PiGo (based on elgg) on a intranet network, and it is currently installed in a Dual Intel Xeon 3.06 Ghz with 4 GB of RAM. I've been having issues when I have 50 users connected at the same time taking tests. So I was thinking to install elgg in two desktop computers and keep the database on the main server. I can't get a VPS because there's no internet service because it is a remote area.

Thanks!