LENOVO Y50 GTX860M 4GB Based on MAXWELL or Kepler?

I checked the Nvidia control panel on Lenovo Store it said 640 Cuda Core
and 1000Mhz Something of GPU clock speed.
4GB DDR5

Does that mean its Kepler or Maxwell?

I asked Lenovo staff they didn't even know what is Maxwell or kepler…

You asked Lenova staff about an NVidia product.
They want to sell you the cake, not tell you the ingredients.

But anyways…
The 860M? It's Maxwell.
Pure & simple.
http://www.notebookcheck.net/...589.0.html