Good old John S probably just saved you some money by fitting decent gear.?
I think that's old or should say, early C11 board.? If you notice the board is full of plug-in chips rather than surface mount like many cheaper boards use, this is done so can easily swap them out if one blows up.

Cnc4pc is owned and run by a guy called Arturo who's a very helpful guy so maybe worth dropping him an email. He'll tell you which chip you need and more than likely sell you one.