Below are the ESPN Football Power Index rankings for Oct. 27, after Week 7 of the 2015 NFL season. For a full explanation of how the FPI is put together, please read this explainer. For more background, you also can read this Q&A.

A few notes heading into Week 8:

Not all of the NFL’s undefeated teams are equal, FPI shows.

The New England Patriots continue to be No. 1 in FPI, but the other undefeated teams are ranked third (Green Bay Packers), eighth (Cincinnati Bengals), 10th (Carolina Panthers) and 11th (Denver Broncos).

The Patriots have the most powerful offense in the NFL, nearly three points better than any other team’s. The Broncos, in contrast, have the 30th-ranked offense in FPI, projected to be more than 12 points per game worse than the unit Tom Brady leads.

The Broncos’ strength lies on defense. They have the top-ranked defense by FPI, whereas the Patriots have the worst defense among the undefeated teams, projected to be about six points worse than the Broncos’.

Among notable movers after Week 7, the New York Jets gained 0.3 in their FPI rating and moved up two spots to fourth despite their loss to the Patriots, and the Panthers rose three spots to 10th after their victory over the Philadelphia Eagles.

Not surprisingly, the best Week 8 game in terms of matchup quality is Sunday’s game between the Packers and the Broncos. There is a wide gap between their FPI ranks, but the difference in their FPI rating is 3.0. The game is at Denver, and FPI sees it as essentially a toss-up: The Packers are 50.3 percent likely to win, according to FPI, and the Broncos have a 49.3 percent likelihood of winning (0.4 percent chance of a tie).