During the first week of sales of Rockstar's GTA IV Microsoft claim 40 per cent of the games were sold with an Xbox 360.
Microsoft claim a significant sales increase for the Xbox 360 with a 54 per cent jump in purchases.
The console can be bought as a package and this has attracted new buyers with the resultant other title sales pushing the Xbox 360 up the charts.
ChartTrack UK say 514,000 Xbox 360 owners bought Grand Theft Auto IV in the first week, while only 413,000 copies of the game were sold on Sony's PlayStation 3 console.