Both IDC and Gartner have released their third-quarter PC shipment numbers. While their figures may be contrasting, they paint identical pictures of a quarter that saw underwhelming growth in PC shipments. According to IDC, global PC shipments grew 10.5 percent during the quarter, which is 3 percent less than its forecast. But according to Gartner, PC shipments only grew 7.6 percent during the quarter, ending up well below its estimate of 12.7 percent. Analysts blamed poor back-to-school demand for lower-than-expected results. They also feel that the tablet upsurge is bound to eat into the market for secondary PCs.