Intel ( NAS: INTC ) and Microsoft ( NAS: MSFT ) led the Dow's tumble, falling 2.7% and 1.7%, respectively. Intel hit a new 52-week low as Bernstein Research cut its rating to underperform, saying that recent revenue growth was due more to a price increase than to an increase in unit sales, as PC sales have been weak. The top chipmaker also announced it will lay off 7,100 workers from its McAfee division, evidence that the 2010 acquisition may not be going as planned. Microsoft, meanwhile, seems down on the IMF's warning and nervousness about earnings and the upcoming release of Windows 8. McDonald's ( NYS: MCD ) was far and away the biggest gainer on the Dow, rising 0.6% on the news that it will start making iPads available for customers to use in some of its restaurants.