The researchers reported somewhat different figures for U.S. shipment growth. Dataquest pegged U.S. growth for PC shipments at 11.5 percent in the second quarter of this year, compared with the same quarter last year, and IDC reported 7.2 percent growth.
Both Dataquest and IDC blamed saturation of the U.S. PC market for the low growth compared to emerging markets in Japan, Latin America and the Asia-Pacific region. In particular, Dataquest said vendors in the U.S. must find ways to persuade end users to replace their PCs more frequently.
The U.S. accounts for 37 percent of the world PC market, according to Dataquest, adding that saturation will be a continuing challenge to future growth. IDC echoed the sentiment.
"The U.S. consumer market had been on fire for the last year and a half and is showing signs of slowing down," said IDC analyst Bruce Stephen.
In Asia, "there's been a fairly consistent pattern in place for the last year. ... They had a severe downturn a couple of years ago, but they've come out of it rather robustly," he said. "This growth in Asia is driven by consumer demand."
Compaq Computer retained the top spot for global shipments. Both companies said Compaq shipped almost 4 million PCs, for about 13 percent of the market, Compaq's unit shipments grew about 6 percent from the same quarter last year, compared to the shipment growth of number-two computer maker Dell, which Dataquest set at 24.6 percent and IDC put at 22.3 percent. Dell shipped 3.4 million units according to Dataquest and slightly less, based on IDC figures. Third-ranked Hewlett-Packard registered 34 percent growth with 2.2 million units shipped.
IBM continued to rank fourth with about 7 percent of the market, but experienced a 4.1 percent decline in shipments, evidence of their withdrawal from the U.S. retail channel, according to both market researchers. IBM shipped almost 2.25 million units, according to both research companies.