Hi,
Providing a single mrays/s number here is quite difficult as the ray tracing performance depends on so many factors, e.g. scene complexity, primitive distribution in the scene, coherent/incoherent ray distribution, whether single, packet, or ray streams are used, closest-hit or any-hit rays, SIMD utilization during shading and to generate rays, HW core/thread count, sustained core turbo frequency, work distribution among the threads etc. It might be better to benchmark the entire rendering application to get a meaningful number. Assuming (for the sake of simplicity) that the renderer is equally efficient per clock on both a Xeon and Xeon Phi system and the work distribution scheme achieves linear scaling than the relative performance can be very roughly compared by: #cores * sustained core frequency between the two platforms.
