I doubt it matters what hardware you throw at your server at that point. You should be ecstatic just to have 35 players on your server and still run stable. Maybe someday someone will create a mod that allows portals to be implemented into the game which connects multiple servers together. (I've seen it done in Minecraft)
Also, I doubt your 16GB of ram has much head room left after having 35 players online. I'd recommend at least 20GB of total ram for that amount of players. Though, without seeing how the CPU and ram is handling the game, I can't know for sure.