The consoles went on sale Friday in the US and Canada.
Andrew House, president and group CEO for Sony Computer Entertainment Inc, said in a release yesterday that sales remain strong in North America. The company will launch the gaming system in Europe and Latin America on November 29.
Sony has said it expects to sell 5 million units by the end of its fiscal year in March.
The PlayStation 4 is Sony's first new video game console in seven years. It faces competition from Microsoft Corp.'s new Xbox One, which goes on sale this week.