The iPad is mighty but not mightier than the HP.
The study shows that the worldwide PC market grew by 19 percent year over year in the fourth quarter with 10.8 million computers being shipped.
Apple shipped 11.5 million computers and iPads in the fourth quarter of 2010, up from 3.4 million the previous year.
The change marks a growth of 241 percent for Apple, by far the largest jump of any of the top sellers.
For its part, HP shipped 18.7 million devices and controls 17.7 percent of the market.