I'm trying to find some information somewhere on recommendations for RAM and CPU for a server install.

I have ZCM 10.1.2a installed on a Xeon 3.0 Ghz machine with 2Gb of RAM. It will be managing around 400-500 clients, but will grow to 750+ over the next 3 years. Will this server be enough for the short term (I am planning to upgrade this server later in the year as it is over 3 years old and out of warranty).