Double whammy attack by the wi-fi versions of iPad 4 and iPad mini.
Comparatively, the figure doubles the 1.5m wi-fi only iPad 3 units sold over three days back in March.
Tim Cook, CEO, said: "Customers around the world love the new iPad mini and fourth generation iPad.
"We set a new launch weekend record and practically sold out of iPad minis. We're working hard to build more quickly to meet the incredible demand."
Demand for iPad mini exceeded initial supply and some pre-order customers will have to wait until later this month to receive their shiny 7.9-inch tablets.