[Maxximou5]

How many servers of what exactly?

Regardless, it's going to remain the same as it has been for years, 1 core/2 thread. As I've mentioned before -
https://forums.alliedmods.net/showthread.php?t=325278
https://forums.alliedmods.net/showthread.php?t=318485
https://forums.alliedmods.net/showthread.php?t=327724
https://forums.alliedmods.net/showthread.php?t=324665

If you want to overload your machine, you can do 1 server for every 1 thread, but at this point you will get poor performance.