The iPad has been out only since April, and has already surpassed a 27-year-old product, the Mac, in unit shipments.

FORBES: Apple and the Mac: No iPad Cannibalization In Sight

Better-than-expected chip supplies mean lower prices for Mac users who want the fastest unit.

FORBES: Apple Does Duets

Mac sales came in at 4.13 million units, a 23 percent unit increase over the year-ago quarter.

FORBES: Apple Crushes It, Reports Net Income of $6.43 Per Share, Sales Of $26.7 Billion