Top PC vendor Hewlett-Packard also saw its worldwide PC shipments grow by 5.3 percent in the quarter, despite reports that the company may spin off its PC business.

Both research firms said growth for the quarter failed to reach earlier projections. IDC said at the end of the third quarter, worldwide PC shipments increased by 3.6 percent year-over-year, below its earlier 4.5 percent growth projection.

Gartner said PC shipments grew by 3.2 percent year-over-year, which was lower than the research firm's original projection of 5.1 percent growth for the quarter.

Analysts have pointed to sluggish spending because of weak economic conditions as a key reason behind the slowdown in PC growth. The rise of tablets has also hurt shipments.

"For the moment, PCs have taken a backseat to a range of other devices competing for shrinking consumer and business budgets," said IDC analyst Jay Chou in a statement.