Their level of military technology is not very far below South Korea's. Certainly not far enough for the disparity to become a significant force multiplier.
If it comes to war, South Korea is probably lost.
By the time the US can pull sufficient troops from Central Asia, or muster sufficient reserves from the US itself, Kimmie will be plotting an invasion of Japan.
The North has a 2 to 1 advantage in active duty personnel and a 5 to 1 advantage in armored vehicles--with "modern" vehicles alone outnumbering South Korea's 2-1.
Plus, it's believed that North Korea can mobilize it's 8 million reserves in the course of a few days, whereas South Korea would take several weeks.
But, the North isn't going to start it.
They understand that they have at most a couple of months of war before their supply reserves are depleted.
Well more than enough time to take the South and utterly destroy all traces of it and its people.
But then they've blown their load.
They would then need to rely on Obama being too much of a pansy to respond. Which they won't consider a good bet with a new Republican-controlled House coming into office; and Obama needing anything to boost his ratings.