In the May-July period, Kindles accounted for 17 percent of all tablets sold in the U.S., compared to 48 percent for Apple's iPad and 8 percent for Samsung's Galaxy line, according to NPD.
Globally, Amazon's shipments in the April-June quarter were down 59 percent from a year earlier at 470,000, NPD said. That compared to 14.6 million for Apple's iPad, down 17 percent from a year ago, and 10.8 million for Samsung's Galaxy line, up 539 percent. Amazon sells most of its Kindles around the Christmas holidays, Baker said.
The Kindle HDX models come with Qualcomm's quad-core Snapdragon 800 processor, which is top of the line for tablets. Amazon said they are three times faster than the older Kindle Fire line. For graphics functions, the HDX models are four times faster than before.