Their hardware actually combines hardware rasterization and raytracing. Depending on the implementation, raytracing can have many benefits over rasterization,

Their hardware actually combines hardware rasterization and raytracing. Depending on the implementation, raytracing can have many benefits over rasterization, such as: - ability to produce pixel-perfect shadows - sub-linear complexity on the amount of primitives (vs. linear for rasterization) - rays need not be coherent, i.e one can render non-linear projections or lots of small views Path Tracing also is just another form of Raytracing. They demonstrated that their hardware can be used for it (just read the link).