Gartner has lowered its expectations for growth this year in global IT spending, saying it will rise 2% to $3.7 trillion. Earlier this year, the analyst firm predicted 2013 growth of 4.1%.

The reduction "mainly reflects the impact of recent fluctuations in US dollar exchange rates," Gartner said.

Predicted weaker sales for devices played another role in Gartner's downgrade, analyst and managing vice president Richard Gordon said. Gartner had previously forecast 7.9% growth in device revenue, but has now dropped that estimate to 2.8% due to continued decline in PC sales.

"While new devices are set to hit the market in the second half of 2013, they will fail to compensate for the underlying weakness of the traditional PC market," Gartner said.

Meanwhile, tablet sales are expected to grow 38.9% and mobile phones 9.3% in 2013, according to the announcement. Overall, device revenue will total $695 billion in 2013, Gartner said.

Enterprise software revenue is expected to show the most strength, rising 6.4% this year to $304 billion, driven by higher demand for CRM (customer relationship management) software.

Data center systems sales will rise 2.1% to $143 billion and IT services revenue is set to jump 2.2% to $926 billion, both slightly higher growth rates than in 2012, according to Gartner.

The largest segment in Gartner's survey, telecom spending, will rebound this year, growing 0.9% to $1.65 trillion. "Fixed broadband is showing slightly higher than anticipated growth," Gartner said. "The impact of voice substitution is mixed as it is moving faster in the consumer sector, but slightly slower in the enterprise market."

Last year, telecom spending fell 0.7%.