Well when i was in high school I got a 5 in all seven AP classes I took, twin brother got a 5 in all 11 tests he took. TBH pretty much everyone I knew in high school got nothing but 5's usually on between 5-10 tests, people didn't take AP classes unless they knew they were gonna get a 5.
Not sure what they say about inherent intelligence, probably not all that much, but they say ALOT about how good of a high school you went to since its the quality of the teachers getting people 5's, not that everyones all a genius or something. Like our AP chemistry teacher had 23/24 people my year get a 5, and that was pretty standard for him. I think every person who ever took AP comp sci at my school got a 5, at least the three years i know of and before that i don't think it was taught.