[quote="Elizium23, post:3, topic:243994"]
Wikipedia: Magisterium. This is a helpful chart that exactly explains your question.
I'm afraid the Wikipedia article is in error. It states that the exercise of the Ordinary Magisterium is "non-infallible." That is not true. The Ordinary Magisterium can exercise infallibility when the bishops are united on a teaching on doctrine or morals that each has taught to be definitive.
Catholic Encyclopedia: Tradition and Living Magisterium This is a more authoritative article that does not mention the ordinary vs. extraordinary difference.
The distinction between the Ordinary and Extraordinary Magisterium is given in the old Catholic Encyclopedia article on INFALLIBILITY. It refers to the Extraordinary Magisterium as the "SOLEMN Magisterium," in distinction from the Ordinary Magisterium.
The Catechism of the Catholic Church: Moral Life and the Magisterium of the Church Various tidbits about the Magisterium, but no mention of the extraordinary.
The CCC gives a somewhat good explanation of the distinction in 891 and 892.