This report presents worldwide PC and worldwide desktop PC market volume per year for the period 2003 - 2014 and per quarter for the period 1Q 2008 - 4Q 2010. Also included are forecasts of worldwide desktop PC market volume and share by region and by CPU connector type. This report also provides comparison of worldwide motherboard and desktop PC market volume. This research finds that the worldwide PC market volume is forecasted to see steady growth during the period 2011 - 2015. Meanwhile, the worldwide desktop PC market volume - which managed to inch up in 2010 in the wake of a double-digit year-on-year decline in 2009 - is expected to witness slight year-on-year growth during the period 2011– 2012. However, it is anticipated that the market volume will begin to see a year-on-year decline after 2012 and into the next three years thereafter, given the fact that other than North American and European countries, the DTR (Desktop Replacement) effect will be seen in the emerging markets as well during the period 2013-2015.