chat theory question

Hello all,
I am writing a game that is using a server to allow multi-use. another feature I want to add to the game is a chat area, but my question is, should I set this up as a seperate server than that of the game and its requests? or should I just send the chat requests in with the game server as well?

My question stems from not wanting to overload the server with requests, and in theory, if the game has like 50 people all on, and they are also chatting, would using 1 server to handle it all possibly be too much??

Thanks for any advise on this. I know that without hard testing there is no way of knowing if the server can handle such things, but I am just hoping as a theory you all could steer me in the right direction.

Thank you,
Bob