The minimal PS3/360 gap will be 3.5M and maximal 5.5M by the end of 2009

[PS3beats360]

The PS3 will only be 3 to 4 million units behind the XBox 360 by the end of 2009. By July 1, 2010 PS3 will be in front of the XBox 360 in total lifetime console sales. PS3 will reach 40 million console units before the XBox 360.