Despite recent jitters over a slowdown in tech demand, the PC industry still managed to deliver double-digit growth in the third quarter, according to reports from two leading market researchers. But analysts also flagged concerns about whether the sturdy growth rate was sustainable.

Corporate demand for PCs helped fuel a 12% rise in computer shipments worldwide, to just over 44 million units in the third quarter, according to a Monday release from market research firm IDC.

Rival research firm Gartner, which calculates shipments differently, posted a slightly lower growth figure of about 10%.

Both research outfits pointed to some worrying signs for the industry in the near future, particularly in Asia. Gartner, which reported 11% shipment growth in China in the third quarter, said Beijing's efforts to slow economic growth in China could weigh on PC demand there.

IDC also noted that worldwide consumer buying looked somewhat soft, going into the fourth quarter.

IDC and Gartner both crowned

Dell

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the number one PC vendor worldwide, with IDC pegging Dell's share at 16.8%.

Dell grew fastest of the top five PC vendors, with 21% growth in shipments over last year's levels.

Hewlett-Packard

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ranked second, clocking in at 15% share, followed by

IBM

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in third place with 5.6% growth.