Worldwide IT spending is projected to total $3.8 trillion in 2013, a 4.1 percent increase from 2012 spending of $3.6 trillion, according to the latest forecast by Gartner Inc.

“The global steady growth rates are a calm ocean that hides turbulent currents beneath,” said John Lovelock, research vice president at Gartner. “The Nexus of Forces social, mobile, cloud and information are reshaping spending patterns across all of the IT sectors that Gartner forecasts. Consumers and enterprises will continue to purchase a mix of IT products and services; nothing is going away completely. However, the ratio of this mix is changing dramatically and there are clear winners and losers over the next three to five years, as we see more of a transition from PCs to mobile phones, from servers to storage, from licensed software to cloud, or the shift in voice and data connections from fixed to mobile.”

Worldwide devices spending, which includes PCs, tablets, mobile phones and printers, is forecast to reach $718 billion in 2013, up 7.9 percent from 2012. Despite flat spending on PCs and a modest decline in spending on printers, a short-term boost to spending on premium mobile phones has driven an upward revision in the devices sector growth for 2013 from Gartner’s previous forecast of 6.3 percent.

The outlook for 2013 for data-center systems spending is forecast to grow 3.7 percent in 2013, down 0.7 percent from Gartner’s previous forecast. This reduction is largely due to cuts to the near-term forecast for spending on external storage and the enterprise in the economically troubled EMEA region.

Worldwide enterprise software spending is forecast to total $297 billion in 2013, a 6.4 percent increase from 2012. Although the growth for this segment remains unchanged from Gartner’s previous forecast, this belies significant changes at a market level, as stronger growth expectations for database management systems (DBMS), data-integration tools and supply chain management compensate for lower growth expectations for IT operations management and operating systems software.

While the outlook for IT services remains relatively unchanged since last quarter, continued hesitation among buyers is fostering hypercompetition and cost pressure in mature IT outsourcing (ITO) segments and reallocation of budget away from new projects in consulting and implementation.

The global telecom services market continues to be the largest IT spending market and will remain roughly flat over the new several years, with declining spending on voice services counterbalanced by strong growth in spending on mobile data services.