From 1981 until Florida snuck into the 2006 BCS Championship game and proceeded to obliterate Ohio State, 2 SEC schools had combined for 1.5 national championships. Since that game, 5 different SEC schools have combined for 12 total national championships. In that same time, 3 non-SEC schools have combined for 4 national championships (Clemson 2, Florida State 1, Ohio State 1).
To find 5 different national championship winning schools in each conference, you have to back to:
SEC - 2008
Big Ten - 1958
ACC - 1953
Big 12 - 1939 if you include any school to ever have been a member (this includes Nebraska, Colorado, and Texas A&M - only Texas, Oklahoma, and TCU have won titles of current schools)
Pac 12 - Never, but 4 schools if you go back to 1922 (only USC and UW have won since Stanford won in 1926)
Ivy League - 1908 (none since 1927)
Just an absolutely incredible run like nothing else since the early days of college football and the Ivy League
To find 5 different national championship winning schools in each conference, you have to back to:
SEC - 2008
Big Ten - 1958
ACC - 1953
Big 12 - 1939 if you include any school to ever have been a member (this includes Nebraska, Colorado, and Texas A&M - only Texas, Oklahoma, and TCU have won titles of current schools)
Pac 12 - Never, but 4 schools if you go back to 1922 (only USC and UW have won since Stanford won in 1926)
Ivy League - 1908 (none since 1927)
Just an absolutely incredible run like nothing else since the early days of college football and the Ivy League