How many DedicatedServers can be runned on a machine?

Hi, I am confusing about how many DedicatedServers can be runned on a machine, and what is the recommended equipment of the server machine?

https://forums.unrealengine.com/archive/index.php/t-52302.html

In this forum,joeGraf said," Gears of War 3 runs dozens of them per machine. ", what is the equipment of the machine?

The general Answer is Messure it and adapt to your Server Hardware to fit your Game. There is no this Server can Handle X Players it just depends on to many things.

Thanks you.

I just want to know a common situation and the possibility of the maximal DedicatedServers run on a normal machine.

Can some one talk about it?