The problem with thunderbolt 2 : its going through the PCI-2 and not the PCI-3 lanes wich are used for graphic cards so there is a bottleneck.
But the bigger problem either, is that the compatibility are not so simple. Actually connecting an external GPU to a nmp will give you an error code 12 in Windows bootcamp and there is no drivers for pascals cards in iOS for the moment. soon...with sierra
Theoretically you could do " WhatEver You Want " but sadly the true is that the nmp design is quiet "upgrade less" and you have to be a very confirmed programmer, they dont give actually the solution because programmers are fighting : http://forum.netkas.org
Or the other solution could be to adapt the hardware, which is not so clean as software re-programming, but could give the possibility to use the PCI-3 Lanes with only 1 GPU and at least had a 2nd internal PCI based flash storage to the other free PCIe3 such as the new intel ssd.
if you know a solution to really make an oGPU work on nmp tell me :-)
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