I don't think this is true. While one card can put you in the good 700's, you need a diversified and mature credit history to be in the 800's. Can the experts chime in?
I think it was 849 last month
810 and wife is 817This is the first year we've ever cracked the 800's and it feels pretty good. Surprising how an arbitrary and ridiculous number can make you proud that people who don't know you can judge your ability to pay your bills..