On that specs, I'd say you might want to start on the lowest possible setting for both the game and the streaming platform. Don't expect eye candy worthy details or streams.
It's only 2 Cores and Very Low memory this should fine for play the game (At least on Low settings) i don't think you would be able stream not even 720p for sure.
i5 4570+ Extra 8GB of RAM might do it and make sure you have Gigabit LAN as well