Nope, there will be no great power wars while MAD still exists (and it does between china and the US).
At best, you will get some kind of military skirmish before they decide to pull out the nukes. There will likely be threats of nuclear exchange which lead to a cease fire. If there is no cease fire, than God help us all.
But no, two nuclear armed states are not going to fight a large scale conventional war. Partly this is because the US would spank China in a conventional war.