SourceSurprisingly or not, the GM107 has landed in mobile segment. The newest GeForce 800M series will kick off with Maxwell GPUs very soon.
GeForce GTX 860M will use the same GPU variant as desktop GTX 750 Ti. It packs 640 CUDA cores, 40 TMUs and 16 ROPs. The GPU-Z didn't read core clocks correctly, so all we have is memory clock of 1253 MHz (5 GHz effective).