SEOUL, July 26 (Reuters) - South Korea’s SK Hynix Inc on Thursday said second-quarter operating profit rose 83 percent from a year earlier, beating market estimates.

The world’s second-largest memory chip maker behind Samsung Electronics Co Ltd said April-June profit was 5.6 trillion won ($5 billion), compared with a 5.4 trillion won Thomson Reuters StarMine SmartEstimate from a survey of 21 analysts.

Revenue climbed 55 percent to 10.4 trillion won in the second quarter from a year earlier. ($1 = 1,115.8200 won) (Reporting by Heekyong Yang and Ju-min Park; Editing by Stephen Coates)