Good explanation may be found there: http://www.extremetech.com/gaming/150892-nvidia-gave-amd-ps4... "Two years ago, in January 2011, Nvidia CEO Jen-Hsun Huang told reporters that the Sony-Nvidia deal had earned Nvidia $500M in royalties since 2004. The total number of shipped PS3 consoles by March, 2011 stood at 50 million according to data from the NPD group."