Hi Brian. Type X drywall is not even close to wonderboard. It's used as a piece of a system when building a firewall. Such as using 5/8 type X (20 min burn) 2x4 framing space (20 min burn) and another layer of type X on the other side (20 min burn) to give you a 1 hour rating on a fire wall. But it will definately burn. It's just rated to burn in 20 minutes. Follow the directions and don't assume that type x will protect you. It just gives the fire dept more time to get to you.