From this chart (using 2012-2016 stats) we are able to see just what is being paid to who. All the conference are represented here, but Alabama (SEC) leads the chart with Nick Saban's illustrious, GOAT salary level. The trend-line is in light blue, so the pattern seems to be averaging out to $5M.
Sources from 2015:
1) http://sports.usatoday.com/ncaa/salaries/
2) https://www.si.com/college-football/2015/10/08/highest-paid-college-football-coaches-salaries-list-nick-saban-jim-harbaugh
