There has been a lot of talk about the power needed to power VR, it seems PlayStation VR has the same issue. PlayStation VR will need an external box to enable the unit to display all the content in VR. This processing unit will do much of the heavy lifting for the PlayStation 4, ensuring everyone will get a smooth experience.
These details came to light after Sony’s Ram Madhavan gave information at the Unite 2015 Developer Conference in Boston.
According to Madhavan, the processing unit will do "most of the heavy lifting for the VR itself." They also have "made it much more powerful, and are improving as they go to the launch." This PU should ensure that people developing on the PlayStation platform should have the power they need to make the games people will want to play. This all in one design will also help with adoption of VR, since you only need a PS4 and the PlayStation VR to get started.
You can watch the full presentation from the Unite 2015 conference here.