how many clients can i put on one server?

Everything depends on what applications are runned on your server. It also depends on the site you have. You should not look at that as.. I need to put 1000 clients on it.. you should put it.. and when you see that the server is becoming overloaded... you simplily move some to a new server.

 

you can have 2000 clients on your server if they all have a static webpage with their name , rank and serial number on it.

If you have real users, people who have scripts running, use databases, etc, it's more like 500.

If these 500 users have 2,3 or more email accounts each and most do, they will then want to run spam assassin, your server will soon become such a mess that you will transfer 250 of these user to a new server. Exim will go nuts, your loads will be high and each cpanel update to fix what's wrong will add to your sorrows.

So the answer to your question is: There is no answer. Go with the flow. If it becomes unbearable and loads prevent your server from operating within your established nerve comfort zone, get a second server.

L