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And it is indeed a 640 core Maxwell (GTX 750 Ti) like we speculated together earlier.

GPU-Z of GTX 860M.
(It does not read the core clocks correctly but you will notice that it have high voltage VRAM since they are running at a whopping 1254MHz something my GTX 770M can`t even do since I`m stuck with low voltage VRAM. Awesome!)