The Tech Report published a review on the GeForces 800M series combines Maxwell, Kepler
A quote from the article:
Spring is almost here, and yet again, Nvidia has marked the equinox (or just about) with a series of new mobile graphics processors. The GeForce 800M family spans six new models, introduces power-saving mojo called Battery Boost, and features both Nvidia's latest Maxwell architecture as well as the older Kepler architecture.GeForces 800M series combines Maxwell, Kepler @ The Tech Report