I’m developing a multiplayer iOS game and I’m intending to host it on a 8 processor Mac Pro. My question is do I gain any performance by upgrading the Mac Pro’s graphics card?
If you’re using a Unity program as your server, upgrading the graphics card isn’t necessary. As described in the bottom of this page, you can run a Unity program with -batchmode which will strip all rendering and input out, removing the need for a GPU.